But it doesn't have to be that way. While it's true that babies grow really fast, it is possible to buy clothes for them that will fit - at least for now. Use our size and age chart to help determine what size you should buy.
Remember: when in doubt, make your purchase based on weight and height rather than age! It's always safe to go one size bigger.
US Size and Age Chart
| Age/Size | Weight | Length | Bootie/Shoe Size | Sock Size |
| Newborn | Up to 7 lbs | Up to 17" | N/A | N/A |
| Up to 3 Months | 7-12 lbs | 17-23" | 3 | Up to 6 Months |
| 3-6 Months | 12-17 lbs | 23-27" | 4 | Up to 6 Months |
| 6-12 Months | 17-22 lbs | 27-29" | 5 | 6-12 Months |
| 12-18 Months | 22-27 lbs | 29-31" | 6 | 12-24 Months |
| 18-24 Months | 27-30 lbs | 31-33" | 7 | 12-24 Months |
