Brand vs brand

babyGap vs Wonder Nation sizes

Of babyGap's 9 baby and toddler sizes, 3 line up closely with a Wonder Nation size, 6 are partial matches, and 0 have no clean match. Both charts list weight and height, so the comparison uses both.

Closest pairs: babyGap 0-3M = Wonder Nation 0-3M, babyGap 12-18M = Wonder Nation 18M, babyGap 18-24M = Wonder Nation 24M.

Watch the labels: babyGap 0-3M is closer to Wonder Nation 0-3M than to Wonder Nation's own 0-3M; babyGap 3-6M is closer to Wonder Nation 3-6M than to Wonder Nation's own 3-6M; babyGap 2Y is closer to Wonder Nation 3T than to Wonder Nation's own 2Y.

babyGap True to sizeWonder Nation Runs small

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)

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

Wonder Nation

Preemie: up to 5 lb
Newborn: 5.5 to 7.5 lb
0-3M: 6.5 to 12 lb
3-6M: 12.5 to 16 lb
6-9M: 16.5 to 19 lb
12M: 19.5 to 22 lb
18M: 22.5 to 26 lb
24M: 26.5 to 30 lb
2T: 26.5 to 30 lb
3T: 30.5 to 34 lb
4T: 34.5 to 38 lb

Height (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

Wonder Nation

Preemie: up to 17 in
Newborn: 17.5 to 21 in
0-3M: 20.5 to 23 in
3-6M: 23.5 to 26 in
6-9M: 26.5 to 27.5 in
12M: 28 to 29.5 in
18M: 30 to 31.5 in
24M: 32 to 33.5 in
2T: 32 to 33.5 in
3T: 34 to 37.5 in
4T: 38 to 41.5 in

babyGap size to Wonder Nation size

babyGap	Closest Wonder Nation	Match	Weight: babyGap / Wonder Nation	Height: babyGap / Wonder Nation
Up to 7 lb	Newborn	Partial	up to 6.6 lb / 5.5 to 7.5 lb	up to 18.1 in / 17.5 to 21 in
0-3M	0-3M	Close match	6.6 to 11 lb / 6.5 to 12 lb	18.1 to 22.8 in / 20.5 to 23 in
3-6M	3-6M	Partial	11 to 17.6 lb / 12.5 to 16 lb	22.8 to 27.2 in / 23.5 to 26 in
6-12M	12M	Partial	17.6 to 22 lb / 19.5 to 22 lb	27.2 to 29.1 in / 28 to 29.5 in
12-18M	18M	Close match	22 to 26.5 lb / 22.5 to 26 lb	29.1 to 31.1 in / 30 to 31.5 in
18-24M	24M	Close match	26.5 to 30.9 lb / 26.5 to 30 lb	31.1 to 33.1 in / 32 to 33.5 in
2Y	3T	Partial	30.9 to 33.1 lb / 30.5 to 34 lb	33.1 to 35.8 in / 34 to 37.5 in
3Y	3T	Partial	33.1 to 35.3 lb / 30.5 to 34 lb	35.8 to 39 in / 34 to 37.5 in
4Y	4T	Partial	35.3 to 39.7 lb / 34.5 to 38 lb	39 to 42.1 in / 38 to 41.5 in

Wonder Nation size to babyGap size

Wonder Nation	Closest babyGap	Match	Weight: Wonder Nation / babyGap	Height: Wonder Nation / babyGap
Preemie	Up to 7 lb	No clean match	up to 5 lb / up to 6.6 lb	up to 17 in / up to 18.1 in
Newborn	0-3M	Partial	5.5 to 7.5 lb / 6.6 to 11 lb	17.5 to 21 in / 18.1 to 22.8 in
0-3M	0-3M	Close match	6.5 to 12 lb / 6.6 to 11 lb	20.5 to 23 in / 18.1 to 22.8 in
3-6M	3-6M	Partial	12.5 to 16 lb / 11 to 17.6 lb	23.5 to 26 in / 22.8 to 27.2 in
6-9M	6-12M	No clean match	16.5 to 19 lb / 17.6 to 22 lb	26.5 to 27.5 in / 27.2 to 29.1 in
12M	6-12M	Partial	19.5 to 22 lb / 17.6 to 22 lb	28 to 29.5 in / 27.2 to 29.1 in
18M	12-18M	Close match	22.5 to 26 lb / 22 to 26.5 lb	30 to 31.5 in / 29.1 to 31.1 in
24M	18-24M	Close match	26.5 to 30 lb / 26.5 to 30.9 lb	32 to 33.5 in / 31.1 to 33.1 in
2T	18-24M	Close match	26.5 to 30 lb / 26.5 to 30.9 lb	32 to 33.5 in / 31.1 to 33.1 in
3T	2Y	Partial	30.5 to 34 lb / 30.9 to 33.1 lb	34 to 37.5 in / 33.1 to 35.8 in
4T	4Y	Partial	34.5 to 38 lb / 35.3 to 39.7 lb	38 to 41.5 in / 39 to 42.1 in

Try it

Compare any size

I know the size in

Size

What is that in

Every babyGap size in Wonder Nation

Close match

babyGap 0-3M lines up closely with Wonder Nation 0-3M.

Weight (lb)

babyGap 0-3M 6.6 to 11 lb

Wonder Nation Newborn 5.5 to 7.5 lb

Wonder Nation 0-3M 6.5 to 12 lb

Height (in)

babyGap 0-3M 18.1 to 22.8 in

Wonder Nation Newborn 17.5 to 21 in

Wonder Nation 0-3M 20.5 to 23 in

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

Based on published size charts. babyGap chart and Wonder Nation chart.

More comparisons

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