Diaper Sizes

  • Size NB/Newborn (Up to 10 lb) - For small or average-sized newborn infants.
  • Size 1 (8-14 lb) - For larger newborns and infants up to 3 months old.
  • Size 2 (12-18 lb) - For infants from 2 to 6 months old.
  • Size 3 (16-28 lb) - For infants and toddlers from 5 months to 2 years old.

First Year Average Diapers Per Day

  • 0-3 Months up to 10/day
  • 3-6 Months up to 7/day
  • 6-11 Months up to 5/day






The Diaper Calculator below let's you input your estimated baby's weight and the number of children (for multiples) to find out how many diapers you will need for the first year. We've taken the average growth rate of a child and determined the size and count of diapers per week to provide a total of what you can expect for the first year (give or take). Make sure you're sitting down!

Enter Birth Weight & Number of Children

Enter your baby's estimated weight when born. lbs.
How many children will be born?
Calculate Diapers!

Diaper Table

Based on the information provided above this table shows the Week, Estimated Weight, Diaper Size and Total Diapers expected per week for the first year. You can find the total number of diapers for each size in the First Year Diapers Total By Size at the bottom of the page.

Weeks Est. Weight Diaper Size Total Diapers
1 0.00 NB 0
2 0.38 NB 0
3 0.75 NB 0
4 1.13 NB 0
5 1.50 NB 0
6 1.88 NB 0
7 2.25 NB 0
8 2.63 NB 0
9 3.00 NB 0
10 3.38 NB 0
11 3.75 NB 0
12 4.13 NB 0
13 4.50 NB 0
14 4.88 NB 0
15 5.25 NB 0
16 5.63 NB 0
17 6.00 NB 0
18 6.38 NB 0
19 6.75 NB 0
20 7.13 NB 0
21 7.50 NB 0
22 7.88 NB 0
23 8.25 NB 0
24 8.63 NB 0
25 8.88 NB 0
26 9.13 NB 0
27 9.38 NB 0
28 9.63 NB 0
29 9.88 NB 0
30 10.13 1 0
31 10.38 1 0
32 10.63 1 0
33 10.88 1 0
34 11.13 1 0
35 11.38 1 0
36 11.63 1 0
37 11.88 1 0
38 12.13 1 0
39 12.38 1 0
40 12.63 1 0
41 12.88 1 0
42 13.13 1 0
43 13.38 1 0
44 13.63 1 0
45 13.88 1 0
46 14.13 2 0
47 14.38 2 0
48 14.63 2 0
49 14.88 2 0
50 15.13 2 0
51 15.38 2 0
52 15.63 2 0

First Year Diaper Totals By Size

NB 1 2 3 Total
0 0 0 0 0
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