Pampers diaper size Baby weight (in pounds) How long your baby might need this size (in months)
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Size 1 diapers 8-14 2.5
Size 2 diapers 12-18 2.5
Size 3 diapers 16-28 10
Size 4 diapers 22-37 10
How do you know when to move up a diaper size?
Check the waist A diaper should close easily without having to tug and pull at them. Also, consider the rise of the diaper. A properly fitting diaper should come just slightly below your little one's belly button. If it's fitting a little more like a low rise, it's time to move on up!
What age does a size 3 diaper fit?
Diaper Size Age Weight
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2 Four to seven months 12 to 18 pounds
3 Seven to 12 months 16 to 28 pounds
4 18 to 48 months 22 to 37 pounds
5 Three years and up 27 pounds and up