Brand vs brand

Carter's vs Old Navy sizes

Of Carter's 12 baby and toddler sizes, 5 line up closely with a Old Navy size, 6 are partial matches, and 1 has no clean match. Both charts list weight and height, so the comparison uses both.

Closest pairs: Carter's 3M = Old Navy 0-3M, Carter's 6M = Old Navy 3-6M, Carter's 9M = Old Navy 6-12M, Carter's 3T = Old Navy 3T.

Watch the labels: Carter's 2T is closer to Old Navy 3T than to Old Navy's own 2T.

Carter's True to sizeOld Navy True to size

Based on published size charts compared with other brands.

Size by size, on one scale

Each block is one size, placed where the brand's chart puts it. Blocks that sit above each other fit the same baby.

Weight (lb)

Carter's

Up to 5 lb: up to 5 lb
Preemie: up to 6 lb
Newborn: 6 to 9 lb
3M: 9 to 12.5 lb
6M: 12.5 to 17 lb
9M: 17 to 21 lb
12M: 21 to 25 lb
18M: 25 to 28 lb
24M: 28 to 30 lb
2T: 29 to 31 lb
3T: 31 to 33 lb
4T: 33 to 37.5 lb

Old Navy

Up to 7 lb: up to 6.6 lb
0-3M: 6.6 to 13.2 lb
3-6M: 13.2 to 17.6 lb
6-9M: 17.6 to 19.8 lb
6-12M: 17.6 to 22 lb
12-18M: 22 to 24.3 lb
18-24M: 24.3 to 26.5 lb
2T: 26.5 to 28.7 lb
3T: 28.7 to 33.1 lb
4T: 33.1 to 35.3 lb

Height (in)

Carter's

Up to 5 lb: up to 17 in
Preemie: up to 18 in
Newborn: 18 to 21.5 in
3M: 21.5 to 24 in
6M: 24 to 27 in
9M: 27 to 28.5 in
12M: 28.5 to 30 in
18M: 30 to 32 in
24M: 32 to 34 in
2T: 35 to 36.5 in
3T: 36.5 to 39 in
4T: 39 to 41.5 in

Old Navy

Up to 7 lb: up to 21.7 in
0-3M: 21.7 to 24 in
3-6M: 24 to 26.4 in
6-9M: 26.4 to 29.1 in
6-12M: 26.4 to 29.1 in
12-18M: 29.1 to 31.5 in
18-24M: 31.5 to 33.9 in
2T: 33.9 to 36.2 in
3T: 36.2 to 39 in
4T: 39 to 42.1 in

Carter's size to Old Navy size

Carter's	Closest Old Navy	Match	Weight: Carter's / Old Navy	Height: Carter's / Old Navy
Up to 5 lb	Up to 7 lb	No clean match	up to 5 lb / up to 6.6 lb	up to 17 in / up to 21.7 in
Preemie	Up to 7 lb	Partial	up to 6 lb / up to 6.6 lb	up to 18 in / up to 21.7 in
Newborn	Up to 7 lb	Partial	6 to 9 lb / up to 6.6 lb	18 to 21.5 in / up to 21.7 in
3M	0-3M	Close match	9 to 12.5 lb / 6.6 to 13.2 lb	21.5 to 24 in / 21.7 to 24 in
6M	3-6M	Close match	12.5 to 17 lb / 13.2 to 17.6 lb	24 to 27 in / 24 to 26.4 in
9M	6-12M	Close match	17 to 21 lb / 17.6 to 22 lb	27 to 28.5 in / 26.4 to 29.1 in
12M	12-18M	Partial	21 to 25 lb / 22 to 24.3 lb	28.5 to 30 in / 29.1 to 31.5 in
18M	18-24M	Partial	25 to 28 lb / 24.3 to 26.5 lb	30 to 32 in / 31.5 to 33.9 in
24M	18-24M	Partial	28 to 30 lb / 24.3 to 26.5 lb	32 to 34 in / 31.5 to 33.9 in
2T	3T	Partial	29 to 31 lb / 28.7 to 33.1 lb	35 to 36.5 in / 36.2 to 39 in
3T	3T	Close match	31 to 33 lb / 28.7 to 33.1 lb	36.5 to 39 in / 36.2 to 39 in
4T	4T	Close match	33 to 37.5 lb / 33.1 to 35.3 lb	39 to 41.5 in / 39 to 42.1 in

Old Navy size to Carter's size

Old Navy	Closest Carter's	Match	Weight: Old Navy / Carter's	Height: Old Navy / Carter's
Up to 7 lb	Newborn	Partial	up to 6.6 lb / 6 to 9 lb	up to 21.7 in / 18 to 21.5 in
0-3M	3M	Close match	6.6 to 13.2 lb / 9 to 12.5 lb	21.7 to 24 in / 21.5 to 24 in
3-6M	6M	Close match	13.2 to 17.6 lb / 12.5 to 17 lb	24 to 26.4 in / 24 to 27 in
6-9M	9M	Partial	17.6 to 19.8 lb / 17 to 21 lb	26.4 to 29.1 in / 27 to 28.5 in
6-12M	9M	Close match	17.6 to 22 lb / 17 to 21 lb	26.4 to 29.1 in / 27 to 28.5 in
12-18M	12M	Partial	22 to 24.3 lb / 21 to 25 lb	29.1 to 31.5 in / 28.5 to 30 in
18-24M	24M	Partial	24.3 to 26.5 lb / 28 to 30 lb	31.5 to 33.9 in / 32 to 34 in
2T	2T	No clean match	26.5 to 28.7 lb / 29 to 31 lb	33.9 to 36.2 in / 35 to 36.5 in
3T	3T	Close match	28.7 to 33.1 lb / 31 to 33 lb	36.2 to 39 in / 36.5 to 39 in
4T	4T	Close match	33.1 to 35.3 lb / 33 to 37.5 lb	39 to 42.1 in / 39 to 41.5 in

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Size

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Every Carter's size in Old Navy

Close match

Carter's 3M lines up closely with Old Navy 0-3M.

Weight (lb)

Carter's 3M 9 to 12.5 lb

Old Navy Up to 7 lb up to 6.6 lb

Old Navy 0-3M 6.6 to 13.2 lb

Height (in)

Carter's 3M 21.5 to 24 in

Old Navy Up to 7 lb up to 21.7 in

Old Navy 0-3M 21.7 to 24 in

The shaded column is the Carter's range. Bars show what each brand publishes for the size.

Based on published size charts. Carter's chart and Old Navy chart.

More comparisons

Charts retrieved October 4, 2026 (Carter's) and October 4, 2026 (Old Navy). Sources are listed on each brand page. This site is not affiliated with either brand.