Baby Size Kitchen Staples worksheet

1. Closest kitchen staple by weight: A 4-pound bag of sugar

1. A due date is 280 days after the first day of the last period, so count back 280 days to find that starting day

   $\text{Mar 4, 2026}\text{−}280\text{\hspace{0.17em}days}$$=\text{May 28, 2025}$

2. Count the days from the first day of the last period to the counting-from date

   $\text{Jan 6, 2026}\text{−}\text{May 28, 2025}$$=223\text{\hspace{0.17em}days}$

3. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $223\text{÷ 7}$$=\text{31 weeks, 6 days}$

4. Put week 31 into the Hadlock formula for typical weight. The answer is the natural log (ln) of the weight in grams

   $0.578\text{+}0.332\text{×}31-0.00354\text{×}31\text{²}$$=7.4681$

5. Undo the log by raising e (about 2.718) to that power, then round to the nearest gram

   $e^{7.4681}$$=\mathrm{1,751}\text{\hspace{0.17em}g}$

6. Find the kitchen staple nearest in weight, a 4-pound bag of sugar. Divide the baby's typical weight by its weight to compare them

   $\frac{\mathrm{1,751}\text{\hspace{0.17em}g}}{\mathrm{1,814.37}\text{\hspace{0.17em}g}}$$=0.97$

7. The ratio is between 0.67 and 1.5, so the two weigh about the same. That makes it a fair match

   $0.97\text{is within 1.5 times either way →}\text{A 4-pound bag of sugar}$

2. Closest kitchen staple by weight: A dozen large eggs in their shells

1. Put week 24 into the Hadlock formula for typical weight. The answer is the natural log (ln) of the weight in grams

   $0.578\text{+}0.332\text{×}24-0.00354\text{×}24\text{²}$$=6.507$

2. Undo the log by raising e (about 2.718) to that power, then round to the nearest gram

   $e^{6.507}$$=670\text{\hspace{0.17em}g}$

3. Find the kitchen staple nearest in weight, a dozen large eggs in their shells. Divide the baby's typical weight by its weight to compare them

   $\frac{670\text{\hspace{0.17em}g}}{680.39\text{\hspace{0.17em}g}}$$=0.98$

4. The ratio is between 0.67 and 1.5, so the two weigh about the same. That makes it a fair match

   $0.98\text{is within 1.5 times either way →}\text{A dozen large eggs in their shells}$

3. Closest kitchen staple by weight: A cup of all-purpose flour

1. Put week 16 into the Hadlock formula for typical weight. The answer is the natural log (ln) of the weight in grams

   $0.578\text{+}0.332\text{×}16-0.00354\text{×}16\text{²}$$=4.9838$

2. Undo the log by raising e (about 2.718) to that power, then round to the nearest gram

   $e^{4.9838}$$=146\text{\hspace{0.17em}g}$

3. Find the kitchen staple nearest in weight, a cup of all-purpose flour. Divide the baby's typical weight by its weight to compare them

   $\frac{146\text{\hspace{0.17em}g}}{125\text{\hspace{0.17em}g}}$$=1.17$

4. The ratio is between 0.67 and 1.5, so the two weigh about the same. That makes it a fair match

   $1.17\text{is within 1.5 times either way →}\text{A cup of all-purpose flour}$

4. Closest kitchen staple by weight: A cup of white sugar

1. A due date is 280 days after the first day of the last period, so count back 280 days to find that starting day

   $\text{Oct 20, 2025}\text{−}280\text{\hspace{0.17em}days}$$=\text{Jan 13, 2025}$

2. Count the days from the first day of the last period to the counting-from date

   $\text{May 13, 2025}\text{−}\text{Jan 13, 2025}$$=120\text{\hspace{0.17em}days}$

3. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $120\text{÷ 7}$$=\text{17 weeks, 1 day}$

4. Put week 17 into the Hadlock formula for typical weight. The answer is the natural log (ln) of the weight in grams

   $0.578\text{+}0.332\text{×}17-0.00354\text{×}17\text{²}$$=5.1989$

5. Undo the log by raising e (about 2.718) to that power, then round to the nearest gram

   $e^{5.1989}$$=181\text{\hspace{0.17em}g}$

6. Find the kitchen staple nearest in weight, a cup of white sugar. Divide the baby's typical weight by its weight to compare them

   $\frac{181\text{\hspace{0.17em}g}}{200\text{\hspace{0.17em}g}}$$=0.91$

7. The ratio is between 0.67 and 1.5, so the two weigh about the same. That makes it a fair match

   $0.91\text{is within 1.5 times either way →}\text{A cup of white sugar}$

5. Closest kitchen staple by weight: A 4-pound bag of sugar

1. Put week 32 into the Hadlock formula for typical weight. The answer is the natural log (ln) of the weight in grams

   $0.578\text{+}0.332\text{×}32-0.00354\text{×}32\text{²}$$=7.577$

2. Undo the log by raising e (about 2.718) to that power, then round to the nearest gram

   $e^{7.577}$$=\mathrm{1,953}\text{\hspace{0.17em}g}$

3. Find the kitchen staple nearest in weight, a 4-pound bag of sugar. Divide the baby's typical weight by its weight to compare them

   $\frac{\mathrm{1,953}\text{\hspace{0.17em}g}}{\mathrm{1,814.37}\text{\hspace{0.17em}g}}$$=1.08$

4. The ratio is between 0.67 and 1.5, so the two weigh about the same. That makes it a fair match

   $1.08\text{is within 1.5 times either way →}\text{A 4-pound bag of sugar}$

6. Closest kitchen staple by weight: A cup of honey

1. Put week 20 into the Hadlock formula for typical weight. The answer is the natural log (ln) of the weight in grams

   $0.578\text{+}0.332\text{×}20-0.00354\text{×}20\text{²}$$=5.802$

2. Undo the log by raising e (about 2.718) to that power, then round to the nearest gram

   $e^{5.802}$$=331\text{\hspace{0.17em}g}$

3. Find the kitchen staple nearest in weight, a cup of honey. Divide the baby's typical weight by its weight to compare them

   $\frac{331\text{\hspace{0.17em}g}}{339\text{\hspace{0.17em}g}}$$=0.98$

4. The ratio is between 0.67 and 1.5, so the two weigh about the same. That makes it a fair match

   $0.98\text{is within 1.5 times either way →}\text{A cup of honey}$

7. Closest kitchen staple by weight: A jumbo egg (without the shell)

1. Count the days from the first day of the last period to the counting-from date

   $\text{Apr 12, 2025}\text{−}\text{Jan 11, 2025}$$=91\text{\hspace{0.17em}days}$

2. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $91\text{÷ 7}$$=\text{13 weeks, 0 days}$

3. Put week 13 into the Hadlock formula for typical weight. The answer is the natural log (ln) of the weight in grams

   $0.578\text{+}0.332\text{×}13-0.00354\text{×}13\text{²}$$=4.2957$

4. Undo the log by raising e (about 2.718) to that power, then round to the nearest gram

   $e^{4.2957}$$=73\text{\hspace{0.17em}g}$

5. Find the kitchen staple nearest in weight, a jumbo egg (without the shell). Divide the baby's typical weight by its weight to compare them

   $\frac{73\text{\hspace{0.17em}g}}{63\text{\hspace{0.17em}g}}$$=1.16$

6. The ratio is between 0.67 and 1.5, so the two weigh about the same. That makes it a fair match

   $1.16\text{is within 1.5 times either way →}\text{A jumbo egg (without the shell)}$

8. Closest kitchen staple by weight: A jumbo egg (without the shell)

1. Put week 12 into the Hadlock formula for typical weight. The answer is the natural log (ln) of the weight in grams

   $0.578\text{+}0.332\text{×}12-0.00354\text{×}12\text{²}$$=4.0522$

2. Undo the log by raising e (about 2.718) to that power, then round to the nearest gram

   $e^{4.0522}$$=58\text{\hspace{0.17em}g}$

3. Find the kitchen staple nearest in weight, a jumbo egg (without the shell). Divide the baby's typical weight by its weight to compare them

   $\frac{58\text{\hspace{0.17em}g}}{63\text{\hspace{0.17em}g}}$$=0.92$

4. The ratio is between 0.67 and 1.5, so the two weigh about the same. That makes it a fair match

   $0.92\text{is within 1.5 times either way →}\text{A jumbo egg (without the shell)}$

9. Closest kitchen staple by weight: A gallon of milk

1. A due date is 280 days after the first day of the last period, so count back 280 days to find that starting day

   $\text{Jan 2, 2027}\text{−}280\text{\hspace{0.17em}days}$$=\text{Mar 28, 2026}$

2. Count the days from the first day of the last period to the counting-from date

   $\text{Dec 28, 2026}\text{−}\text{Mar 28, 2026}$$=275\text{\hspace{0.17em}days}$

3. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $275\text{÷ 7}$$=\text{39 weeks, 2 days}$

4. Put week 39 into the Hadlock formula for typical weight. The answer is the natural log (ln) of the weight in grams

   $0.578\text{+}0.332\text{×}39-0.00354\text{×}39\text{²}$$=8.1417$

5. Undo the log by raising e (about 2.718) to that power, then round to the nearest gram

   $e^{8.1417}$$=\mathrm{3,435}\text{\hspace{0.17em}g}$

6. Find the kitchen staple nearest in weight, a gallon of milk. Divide the baby's typical weight by its weight to compare them

   $\frac{\mathrm{3,435}\text{\hspace{0.17em}g}}{\mathrm{3,904}\text{\hspace{0.17em}g}}$$=0.88$

7. The ratio is between 0.67 and 1.5, so the two weigh about the same. That makes it a fair match

   $0.88\text{is within 1.5 times either way →}\text{A gallon of milk}$

10. Closest kitchen staple by weight: A large egg (without the shell)

1. A due date is 280 days after the first day of the last period, so count back 280 days to find that starting day

   $\text{Oct 23, 2025}\text{−}280\text{\hspace{0.17em}days}$$=\text{Jan 16, 2025}$

2. Count the days from the first day of the last period to the counting-from date

   $\text{Apr 5, 2025}\text{−}\text{Jan 16, 2025}$$=79\text{\hspace{0.17em}days}$

3. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $79\text{÷ 7}$$=\text{11 weeks, 2 days}$

4. Put week 11 into the Hadlock formula for typical weight. The answer is the natural log (ln) of the weight in grams

   $0.578\text{+}0.332\text{×}11-0.00354\text{×}11\text{²}$$=3.8017$

5. Undo the log by raising e (about 2.718) to that power, then round to the nearest gram

   $e^{3.8017}$$=45\text{\hspace{0.17em}g}$

6. Find the kitchen staple nearest in weight, a large egg (without the shell). Divide the baby's typical weight by its weight to compare them

   $\frac{45\text{\hspace{0.17em}g}}{50\text{\hspace{0.17em}g}}$$=0.9$

7. The ratio is between 0.67 and 1.5, so the two weigh about the same. That makes it a fair match

   $0.9\text{is within 1.5 times either way →}\text{A large egg (without the shell)}$