Brand vs brand

babyGap vs Primary sizes

Of babyGap's 9 baby and toddler sizes, 8 line up closely with a Primary size, 1 is a partial match, and 0 have no clean match. Both charts list weight and height, so the comparison uses both.

Closest pairs: babyGap Up to 7 lb = Primary Newborn, babyGap 0-3M = Primary 0-3M, babyGap 6-12M = Primary 9-12M, babyGap 12-18M = Primary 12-18M.

Watch the labels: babyGap 0-3M is closer to Primary 0-3M than to Primary's own 0-3M; babyGap 3-6M is closer to Primary 3-6M than to Primary's own 3-6M; babyGap 6-12M is closer to Primary 9-12M than to Primary's own 6-12M.

babyGap True to sizePrimary 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)

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

Primary

Newborn: 5.1 to 9 lb
0-3M: 9 to 11.9 lb
3-6M: 11.9 to 15 lb
6-9M: 15 to 18.1 lb
6-12M: 15 to 22 lb
9-12M: 18.1 to 22 lb
12-18M: 22 to 26.9 lb
18-24M: 26.9 to 30 lb
2: 30 to 33.1 lb
3: 33.1 to 35.9 lb
4: 35.9 to 39.9 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

Primary

Newborn: up to 18.1 in
0-3M: 18.1 to 22.8 in
3-6M: 22.8 to 25.2 in
6-9M: 25.2 to 27.2 in
6-12M: 25.2 to 29.1 in
9-12M: 27.2 to 29.1 in
12-18M: 29.1 to 31.1 in
18-24M: 31.1 to 33.1 in
2: 33.1 to 35 in
3: 35 to 38.2 in
4: 38.2 to 40.9 in

babyGap size to Primary size

babyGap	Closest Primary	Match	Weight: babyGap / Primary	Height: babyGap / Primary
Up to 7 lb	Newborn	Close match	up to 6.6 lb / 5.1 to 9 lb	up to 18.1 in / up to 18.1 in
0-3M	0-3M	Close match	6.6 to 11 lb / 9 to 11.9 lb	18.1 to 22.8 in / 18.1 to 22.8 in
3-6M	3-6M	Partial	11 to 17.6 lb / 11.9 to 15 lb	22.8 to 27.2 in / 22.8 to 25.2 in
6-12M	9-12M	Close match	17.6 to 22 lb / 18.1 to 22 lb	27.2 to 29.1 in / 27.2 to 29.1 in
12-18M	12-18M	Close match	22 to 26.5 lb / 22 to 26.9 lb	29.1 to 31.1 in / 29.1 to 31.1 in
18-24M	18-24M	Close match	26.5 to 30.9 lb / 26.9 to 30 lb	31.1 to 33.1 in / 31.1 to 33.1 in
2Y	2	Close match	30.9 to 33.1 lb / 30 to 33.1 lb	33.1 to 35.8 in / 33.1 to 35 in
3Y	3	Close match	33.1 to 35.3 lb / 33.1 to 35.9 lb	35.8 to 39 in / 35 to 38.2 in
4Y	4	Close match	35.3 to 39.7 lb / 35.9 to 39.9 lb	39 to 42.1 in / 38.2 to 40.9 in

Primary size to babyGap size

Primary	Closest babyGap	Match	Weight: Primary / babyGap	Height: Primary / babyGap
Newborn	Up to 7 lb	Close match	5.1 to 9 lb / up to 6.6 lb	up to 18.1 in / up to 18.1 in
0-3M	0-3M	Close match	9 to 11.9 lb / 6.6 to 11 lb	18.1 to 22.8 in / 18.1 to 22.8 in
3-6M	3-6M	Partial	11.9 to 15 lb / 11 to 17.6 lb	22.8 to 25.2 in / 22.8 to 27.2 in
6-9M	3-6M	Partial	15 to 18.1 lb / 11 to 17.6 lb	25.2 to 27.2 in / 22.8 to 27.2 in
6-12M	6-12M	Partial	15 to 22 lb / 17.6 to 22 lb	25.2 to 29.1 in / 27.2 to 29.1 in
9-12M	6-12M	Close match	18.1 to 22 lb / 17.6 to 22 lb	27.2 to 29.1 in / 27.2 to 29.1 in
12-18M	12-18M	Close match	22 to 26.9 lb / 22 to 26.5 lb	29.1 to 31.1 in / 29.1 to 31.1 in
18-24M	18-24M	Close match	26.9 to 30 lb / 26.5 to 30.9 lb	31.1 to 33.1 in / 31.1 to 33.1 in
2	2Y	Close match	30 to 33.1 lb / 30.9 to 33.1 lb	33.1 to 35 in / 33.1 to 35.8 in
3	3Y	Close match	33.1 to 35.9 lb / 33.1 to 35.3 lb	35 to 38.2 in / 35.8 to 39 in
4	4Y	Close match	35.9 to 39.9 lb / 35.3 to 39.7 lb	38.2 to 40.9 in / 39 to 42.1 in

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Size

What is that in

Every babyGap size in Primary

Close match

babyGap Up to 7 lb lines up closely with Primary Newborn.

Weight (lb)

babyGap Up to 7 lb up to 6.6 lb

Primary Newborn 5.1 to 9 lb

Height (in)

babyGap Up to 7 lb up to 18.1 in

Primary Newborn up to 18.1 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 Primary chart.

More comparisons

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