Brand vs brand

Cat & Jack vs Nike sizes

Of Cat & Jack's 11 baby and toddler sizes, 1 line up closely with a Nike size, 9 are partial matches, and 1 has no clean match. Both charts list weight and height, so the comparison uses both.

Closest pairs: Cat & Jack 3T = Nike 3T.

Watch the labels: Cat & Jack 12M is closer to Nike 9M than to Nike's own 12M; Cat & Jack 18M is closer to Nike 12M than to Nike's own 18M; Cat & Jack 24M is closer to Nike 18M than to Nike's own 24M.

Cat & Jack True to sizeNike Runs large

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)

Cat & Jack

Preemie: up to 5.5 lb
Newborn: 6 to 8 lb
0-3M: 9 to 12 lb
3-6M: 12.5 to 16 lb
6-9M: 16.5 to 19.5 lb
12M: 20 to 23 lb
18M: 23.5 to 26 lb
24M: 26.5 to 28 lb
2T: 26.5 to 28 lb
3T: 28.5 to 32 lb
4T: 32.5 to 37 lb

Nike

Newborn/0-3M: 6 to 9.5 lb
3M: 9.9 to 14.6 lb
6M: 15 to 17.9 lb
9M: 18.3 to 22 lb
12M: 22.5 to 24.9 lb
18M: 25.6 to 28 lb
24M: 28.4 to 30 lb
2T: 28.4 to 30 lb
3T: 30.4 to 33.1 lb
4T: 34 to 37.9 lb

Height (in)

Cat & Jack

Preemie: up to 17.5 in
Newborn: 18 to 20 in
0-3M: 20.5 to 23.5 in
3-6M: 24 to 25.5 in
6-9M: 26 to 27.5 in
12M: 28 to 30.5 in
18M: 31 to 32.5 in
24M: 33 to 35.5 in
2T: 33 to 35.5 in
3T: 36 to 38.5 in
4T: 39 to 43 in

Nike

Newborn/0-3M: 19.7 to 22 in
3M: 22 to 24.4 in
6M: 24.4 to 26.8 in
9M: 26.8 to 29.1 in
12M: 29.1 to 31.5 in
18M: 31.5 to 33.9 in
24M: 33.9 to 36.2 in
2T: 33.9 to 36.2 in
3T: 36.2 to 38.6 in
4T: 38.6 to 40.9 in

Cat & Jack size to Nike size

Cat & Jack	Closest Nike	Match	Weight: Cat & Jack / Nike	Height: Cat & Jack / Nike
Preemie	None	No clean match	up to 5.5 lb / n/a	up to 17.5 in / n/a
Newborn	Newborn/0-3M	Partial	6 to 8 lb / 6 to 9.5 lb	18 to 20 in / 19.7 to 22 in
0-3M	3M	Partial	9 to 12 lb / 9.9 to 14.6 lb	20.5 to 23.5 in / 22 to 24.4 in
3-6M	6M	Partial	12.5 to 16 lb / 15 to 17.9 lb	24 to 25.5 in / 24.4 to 26.8 in
6-9M	6M	Partial	16.5 to 19.5 lb / 15 to 17.9 lb	26 to 27.5 in / 24.4 to 26.8 in
12M	9M	Partial	20 to 23 lb / 18.3 to 22 lb	28 to 30.5 in / 26.8 to 29.1 in
18M	12M	Partial	23.5 to 26 lb / 22.5 to 24.9 lb	31 to 32.5 in / 29.1 to 31.5 in
24M	18M	Partial	26.5 to 28 lb / 25.6 to 28 lb	33 to 35.5 in / 31.5 to 33.9 in
2T	18M	Partial	26.5 to 28 lb / 25.6 to 28 lb	33 to 35.5 in / 31.5 to 33.9 in
3T	3T	Close match	28.5 to 32 lb / 30.4 to 33.1 lb	36 to 38.5 in / 36.2 to 38.6 in
4T	4T	Partial	32.5 to 37 lb / 34 to 37.9 lb	39 to 43 in / 38.6 to 40.9 in

Nike size to Cat & Jack size

Nike	Closest Cat & Jack	Match	Weight: Nike / Cat & Jack	Height: Nike / Cat & Jack
Newborn/0-3M	Newborn	Partial	6 to 9.5 lb / 6 to 8 lb	19.7 to 22 in / 18 to 20 in
3M	0-3M	Partial	9.9 to 14.6 lb / 9 to 12 lb	22 to 24.4 in / 20.5 to 23.5 in
6M	3-6M	Partial	15 to 17.9 lb / 12.5 to 16 lb	24.4 to 26.8 in / 24 to 25.5 in
9M	12M	Partial	18.3 to 22 lb / 20 to 23 lb	26.8 to 29.1 in / 28 to 30.5 in
12M	18M	Partial	22.5 to 24.9 lb / 23.5 to 26 lb	29.1 to 31.5 in / 31 to 32.5 in
18M	24M	Partial	25.6 to 28 lb / 26.5 to 28 lb	31.5 to 33.9 in / 33 to 35.5 in
24M	24M	Partial	28.4 to 30 lb / 26.5 to 28 lb	33.9 to 36.2 in / 33 to 35.5 in
2T	24M	Partial	28.4 to 30 lb / 26.5 to 28 lb	33.9 to 36.2 in / 33 to 35.5 in
3T	3T	Close match	30.4 to 33.1 lb / 28.5 to 32 lb	36.2 to 38.6 in / 36 to 38.5 in
4T	4T	Partial	34 to 37.9 lb / 32.5 to 37 lb	38.6 to 40.9 in / 39 to 43 in

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Size

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Every Cat & Jack size in Nike

Close match

Cat & Jack 3T lines up closely with Nike 3T.

Weight (lb)

Cat & Jack 3T 28.5 to 32 lb

Nike 24M 28.4 to 30 lb

Nike 2T 28.4 to 30 lb

Nike 3T 30.4 to 33.1 lb

Height (in)

Cat & Jack 3T 36 to 38.5 in

Nike 24M 33.9 to 36.2 in

Nike 2T 33.9 to 36.2 in

Nike 3T 36.2 to 38.6 in

The shaded column is the Cat & Jack range. Bars show what each brand publishes for the size.

Based on published size charts. Cat & Jack chart and Nike chart.

More comparisons

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