Entertainment Fashion & Style Baby Clothes Size and Age Chart Share PINTEREST Email Print Ann Intrieri Paz/The Image Bank/Getty Images Fashion & Style Bumps & Babies Accessories Tops & Sweaters Dresses Skirts Jeans Pants Do It Yourself Shoes Skincare Advice Makeup Hair Fragrance Tattoos and Body Piercings Kids and Teens Learn More By Stacie McClintock Updated on 07/14/17 Buying baby clothes is a lot like playing the lottery; you hedge your bets on a number, and hope it's the right one. 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, except in the case of baby sleepwear. 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 Featured Video By clicking “Accept All Cookies”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. Cookies Settings Accept All Cookies