Brand vs brand

Old Navy vs babyGap sizes

Of Old Navy's 10 baby and toddler sizes, 4 line up closely with a babyGap size, 6 are partial matches, and 0 have no clean match. Both charts list weight and height, so the comparison uses both.

Closest pairs: Old Navy 3-6M = babyGap 3-6M, Old Navy 6-9M = babyGap 6-12M, Old Navy 6-12M = babyGap 6-12M, Old Navy 12-18M = babyGap 12-18M.

Watch the labels: Old Navy Up to 7 lb is closer to babyGap Up to 7 lb than to babyGap's own Up to 7 lb; Old Navy 0-3M is closer to babyGap 0-3M than to babyGap's own 0-3M; Old Navy 3-6M is closer to babyGap 3-6M than to babyGap's own 3-6M.

Old Navy True to sizebabyGap 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)

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

babyGap

Up to 7 lb: up to 6.6 lb
0-3M: 6.6 to 11 lb
3-6M: 11 to 17.6 lb
6-12M: 17.6 to 22 lb
12-18M: 22 to 26.5 lb
18-24M: 26.5 to 30.9 lb
2Y: 30.9 to 33.1 lb
3Y: 33.1 to 35.3 lb
4Y: 35.3 to 39.7 lb

Height (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

babyGap

Up to 7 lb: up to 18.1 in
0-3M: 18.1 to 22.8 in
3-6M: 22.8 to 27.2 in
6-12M: 27.2 to 29.1 in
12-18M: 29.1 to 31.1 in
18-24M: 31.1 to 33.1 in
2Y: 33.1 to 35.8 in
3Y: 35.8 to 39 in
4Y: 39 to 42.1 in

Old Navy size to babyGap size

Old Navy	Closest babyGap	Match	Weight: Old Navy / babyGap	Height: Old Navy / babyGap
Up to 7 lb	Up to 7 lb	Partial	up to 6.6 lb / up to 6.6 lb	up to 21.7 in / up to 18.1 in
0-3M	0-3M	Partial	6.6 to 13.2 lb / 6.6 to 11 lb	21.7 to 24 in / 18.1 to 22.8 in
3-6M	3-6M	Close match	13.2 to 17.6 lb / 11 to 17.6 lb	24 to 26.4 in / 22.8 to 27.2 in
6-9M	6-12M	Close match	17.6 to 19.8 lb / 17.6 to 22 lb	26.4 to 29.1 in / 27.2 to 29.1 in
6-12M	6-12M	Close match	17.6 to 22 lb / 17.6 to 22 lb	26.4 to 29.1 in / 27.2 to 29.1 in
12-18M	12-18M	Close match	22 to 24.3 lb / 22 to 26.5 lb	29.1 to 31.5 in / 29.1 to 31.1 in
18-24M	18-24M	Partial	24.3 to 26.5 lb / 26.5 to 30.9 lb	31.5 to 33.9 in / 31.1 to 33.1 in
2T	2Y	Partial	26.5 to 28.7 lb / 30.9 to 33.1 lb	33.9 to 36.2 in / 33.1 to 35.8 in
3T	3Y	Partial	28.7 to 33.1 lb / 33.1 to 35.3 lb	36.2 to 39 in / 35.8 to 39 in
4T	3Y	Partial	33.1 to 35.3 lb / 33.1 to 35.3 lb	39 to 42.1 in / 35.8 to 39 in

babyGap size to Old Navy size

babyGap	Closest Old Navy	Match	Weight: babyGap / Old Navy	Height: babyGap / Old Navy
Up to 7 lb	Up to 7 lb	Partial	up to 6.6 lb / up to 6.6 lb	up to 18.1 in / up to 21.7 in
0-3M	0-3M	Partial	6.6 to 11 lb / 6.6 to 13.2 lb	18.1 to 22.8 in / 21.7 to 24 in
3-6M	3-6M	Close match	11 to 17.6 lb / 13.2 to 17.6 lb	22.8 to 27.2 in / 24 to 26.4 in
6-12M	6-12M	Close match	17.6 to 22 lb / 17.6 to 22 lb	27.2 to 29.1 in / 26.4 to 29.1 in
12-18M	12-18M	Close match	22 to 26.5 lb / 22 to 24.3 lb	29.1 to 31.1 in / 29.1 to 31.5 in
18-24M	18-24M	Partial	26.5 to 30.9 lb / 24.3 to 26.5 lb	31.1 to 33.1 in / 31.5 to 33.9 in
2Y	2T	Partial	30.9 to 33.1 lb / 26.5 to 28.7 lb	33.1 to 35.8 in / 33.9 to 36.2 in
3Y	4T	Partial	33.1 to 35.3 lb / 33.1 to 35.3 lb	35.8 to 39 in / 39 to 42.1 in
4Y	4T	Partial	35.3 to 39.7 lb / 33.1 to 35.3 lb	39 to 42.1 in / 39 to 42.1 in

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Size

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Every Old Navy size in babyGap

Close match

Old Navy 3-6M lines up closely with babyGap 3-6M.

Weight (lb)

Old Navy 3-6M 13.2 to 17.6 lb

babyGap 3-6M 11 to 17.6 lb

Height (in)

Old Navy 3-6M 24 to 26.4 in

babyGap 3-6M 22.8 to 27.2 in

The shaded column is the Old Navy range. Bars show what each brand publishes for the size.

Based on published size charts. Old Navy chart and babyGap chart.

More comparisons

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