Baby & Toddler Size Guide

Use this guide as a general reference when shopping baby and toddler clothing at The Baby Boxx. Sizing can vary by brand, so always check the size listed on each product.

Baby Sizes

Size	Approx. Age	Approx. Weight	Approx. Height
Newborn	0–1 Month	Up to 8 lb	Up to 21 in
0–3M	0–3 Months	8–12 lb	21–24 in
3M	About 3 Months	9–12 lb	22–24 in
3–6M	3–6 Months	12–17 lb	24–27 in
6M	About 6 Months	14–18 lb	25–27 in
6–9M	6–9 Months	17–21 lb	27–29 in
9–12M	9–12 Months	20–24 lb	28–31 in
12M	About 12 Months	20–24 lb	29–31 in
12–18M	12–18 Months	22–27 lb	30–33 in
18M	About 18 Months	24–28 lb	32–34 in
24M	About 24 Months	26–30 lb	33–36 in

Toddler Sizes

Size	Approx. Age	Approx. Weight	Approx. Height
2T	2 Years	26–30 lb	33–36 in
3T	3 Years	30–34 lb	36–39 in
4T	4 Years	34–38 lb	39–42 in
5T	5 Years	38–44 lb	42–45 in

Helpful Tip

If your child is between sizes, consider choosing the larger size for extra room. For secondhand clothing, fit can also vary slightly depending on the brand, fabric, and previous washing.

If you have questions about the fit of a specific item, contact The Baby Boxx before ordering. We are happy to help.