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 Outerwear Lingerie & Swimwear Do It Yourself Shoes Skincare Advice Makeup Hair Fragrance Tattoos and Body Piercings Kids and Teens Learn More By Stacie McClintock Updated July 14, 2017 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 How to Find Your Jeans Size: A Step-by-Step Guide Let Your Baby's Weight Determine the Size He Should Wear How to Convert Men's and Women's Shoe Sizes Women's International Shoe Size Conversion What Does is Mean When a Baby Clothes Tag Just Reads 12 Months? European Clothing and Shoe Size Charts for Babies and Kids 5 Baby Clothing Items Every New Parent Should Have Top 5 Inexpensive Newborn Baby Clothes Brands Baby Shoes: US, UK, and European Size Chart for Baby Shoes Learn to Distinguish Between 24 Months and 2T Clothing Sizes Toddler Shoe Tips and Baby Shoe Sizes: U.S. Versus European What You Need to Know About Car Seats from Birth to Booster Clothing Size Conversion Charts for Shopping Abroad How to Buy the Best Baby Clothes Baby Clothes Size: How Tight is Too Tight? How Long Will My New Baby Wear Newborn Baby Clothes?