Brand vs brand

OshKosh B'gosh vs Primary sizes

Of OshKosh B'gosh's 9 baby and toddler sizes, 1 line up closely with a Primary size, 7 are partial matches, and 1 has no clean match. Both charts list weight and height, so the comparison uses both.

Closest pairs: OshKosh B'gosh 9M = Primary 9-12M.

Watch the labels: OshKosh B'gosh 2T is closer to Primary 3 than to Primary's own 2T; OshKosh B'gosh 3T is closer to Primary 2 than to Primary's own 3T.

OshKosh B'gosh 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)

OshKosh B'gosh

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

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)

OshKosh B'gosh

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

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

OshKosh B'gosh size to Primary size

OshKosh B'gosh	Closest Primary	Match	Weight: OshKosh B'gosh / Primary	Height: OshKosh B'gosh / Primary
3M	0-3M	Partial	9 to 12.5 lb / 9 to 11.9 lb	21.5 to 24 in / 18.1 to 22.8 in
6M	6-9M	Partial	12.5 to 17 lb / 15 to 18.1 lb	24 to 27 in / 25.2 to 27.2 in
9M	9-12M	Close match	17 to 21 lb / 18.1 to 22 lb	27 to 28.5 in / 27.2 to 29.1 in
12M	12-18M	Partial	21 to 25 lb / 22 to 26.9 lb	28.5 to 30 in / 29.1 to 31.1 in
18M	12-18M	Partial	25 to 28 lb / 22 to 26.9 lb	30 to 32 in / 29.1 to 31.1 in
24M	18-24M	Partial	28 to 30 lb / 26.9 to 30 lb	32 to 34 in / 31.1 to 33.1 in
2T	3	No clean match	29 to 31 lb / 33.1 to 35.9 lb	35 to 36.5 in / 35 to 38.2 in
3T	2	Partial	31 to 33 lb / 30 to 33.1 lb	36.5 to 39 in / 33.1 to 35 in
4T	4	Partial	33 to 37.5 lb / 35.9 to 39.9 lb	39 to 41.5 in / 38.2 to 40.9 in

Primary size to OshKosh B'gosh size

Primary	Closest OshKosh B'gosh	Match	Weight: Primary / OshKosh B'gosh	Height: Primary / OshKosh B'gosh
Newborn	3M	No clean match	5.1 to 9 lb / 9 to 12.5 lb	up to 18.1 in / 21.5 to 24 in
0-3M	3M	Partial	9 to 11.9 lb / 9 to 12.5 lb	18.1 to 22.8 in / 21.5 to 24 in
3-6M	6M	Partial	11.9 to 15 lb / 12.5 to 17 lb	22.8 to 25.2 in / 24 to 27 in
6-9M	6M	Partial	15 to 18.1 lb / 12.5 to 17 lb	25.2 to 27.2 in / 24 to 27 in
6-12M	9M	Partial	15 to 22 lb / 17 to 21 lb	25.2 to 29.1 in / 27 to 28.5 in
9-12M	9M	Close match	18.1 to 22 lb / 17 to 21 lb	27.2 to 29.1 in / 27 to 28.5 in
12-18M	12M	Partial	22 to 26.9 lb / 21 to 25 lb	29.1 to 31.1 in / 28.5 to 30 in
18-24M	24M	Partial	26.9 to 30 lb / 28 to 30 lb	31.1 to 33.1 in / 32 to 34 in
2	3T	Partial	30 to 33.1 lb / 31 to 33 lb	33.1 to 35 in / 36.5 to 39 in
3	4T	Partial	33.1 to 35.9 lb / 33 to 37.5 lb	35 to 38.2 in / 39 to 41.5 in
4	4T	Partial	35.9 to 39.9 lb / 33 to 37.5 lb	38.2 to 40.9 in / 39 to 41.5 in

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Size

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Every OshKosh B'gosh size in Primary

Close match

OshKosh B'gosh 9M lines up closely with Primary 9-12M.

Weight (lb)

OshKosh B'gosh 9M 17 to 21 lb

Primary 6-9M 15 to 18.1 lb

Primary 6-12M 15 to 22 lb

Primary 9-12M 18.1 to 22 lb

Height (in)

OshKosh B'gosh 9M 27 to 28.5 in

Primary 6-9M 25.2 to 27.2 in

Primary 6-12M 25.2 to 29.1 in

Primary 9-12M 27.2 to 29.1 in

The shaded column is the OshKosh B'gosh range. Bars show what each brand publishes for the size.

Based on published size charts. OshKosh B'gosh chart and Primary chart.

More comparisons

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