Brand vs brand

Old Navy vs Cat & Jack sizes

Of Old Navy's 10 baby and toddler sizes, 2 line up closely with a Cat & Jack size, 7 are partial matches, and 1 has no clean match. Both charts list weight and height, so the comparison uses both.

Closest pairs: Old Navy 3T = Cat & Jack 3T, Old Navy 4T = Cat & Jack 4T.

Watch the labels: Old Navy 2T is closer to Cat & Jack 24M than to Cat & Jack's own 2T; Old Navy 4T is closer to Cat & Jack 4T than to Cat & Jack's own 4T.

Old Navy True to sizeCat & Jack 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

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

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

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

Old Navy size to Cat & Jack size

Old Navy	Closest Cat & Jack	Match	Weight: Old Navy / Cat & Jack	Height: Old Navy / Cat & Jack
Up to 7 lb	Newborn	No clean match	up to 6.6 lb / 6 to 8 lb	up to 21.7 in / 18 to 20 in
0-3M	0-3M	Partial	6.6 to 13.2 lb / 9 to 12 lb	21.7 to 24 in / 20.5 to 23.5 in
3-6M	3-6M	Partial	13.2 to 17.6 lb / 12.5 to 16 lb	24 to 26.4 in / 24 to 25.5 in
6-9M	6-9M	Partial	17.6 to 19.8 lb / 16.5 to 19.5 lb	26.4 to 29.1 in / 26 to 27.5 in
6-12M	6-9M	Partial	17.6 to 22 lb / 16.5 to 19.5 lb	26.4 to 29.1 in / 26 to 27.5 in
12-18M	12M	Partial	22 to 24.3 lb / 20 to 23 lb	29.1 to 31.5 in / 28 to 30.5 in
18-24M	18M	Partial	24.3 to 26.5 lb / 23.5 to 26 lb	31.5 to 33.9 in / 31 to 32.5 in
2T	24M	Partial	26.5 to 28.7 lb / 26.5 to 28 lb	33.9 to 36.2 in / 33 to 35.5 in
3T	3T	Close match	28.7 to 33.1 lb / 28.5 to 32 lb	36.2 to 39 in / 36 to 38.5 in
4T	4T	Close match	33.1 to 35.3 lb / 32.5 to 37 lb	39 to 42.1 in / 39 to 43 in

Cat & Jack size to Old Navy size

Cat & Jack	Closest Old Navy	Match	Weight: Cat & Jack / Old Navy	Height: Cat & Jack / Old Navy
Preemie	Up to 7 lb	No clean match	up to 5.5 lb / up to 6.6 lb	up to 17.5 in / up to 21.7 in
Newborn	Up to 7 lb	No clean match	6 to 8 lb / up to 6.6 lb	18 to 20 in / up to 21.7 in
0-3M	0-3M	Partial	9 to 12 lb / 6.6 to 13.2 lb	20.5 to 23.5 in / 21.7 to 24 in
3-6M	3-6M	Partial	12.5 to 16 lb / 13.2 to 17.6 lb	24 to 25.5 in / 24 to 26.4 in
6-9M	6-9M	Partial	16.5 to 19.5 lb / 17.6 to 19.8 lb	26 to 27.5 in / 26.4 to 29.1 in
12M	6-12M	Partial	20 to 23 lb / 17.6 to 22 lb	28 to 30.5 in / 26.4 to 29.1 in
18M	18-24M	Partial	23.5 to 26 lb / 24.3 to 26.5 lb	31 to 32.5 in / 31.5 to 33.9 in
24M	2T	Partial	26.5 to 28 lb / 26.5 to 28.7 lb	33 to 35.5 in / 33.9 to 36.2 in
2T	2T	Partial	26.5 to 28 lb / 26.5 to 28.7 lb	33 to 35.5 in / 33.9 to 36.2 in
3T	3T	Close match	28.5 to 32 lb / 28.7 to 33.1 lb	36 to 38.5 in / 36.2 to 39 in
4T	4T	Close match	32.5 to 37 lb / 33.1 to 35.3 lb	39 to 43 in / 39 to 42.1 in

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Size

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Every Old Navy size in Cat & Jack

Close match

Old Navy 3T lines up closely with Cat & Jack 3T.

Weight (lb)

Old Navy 3T 28.7 to 33.1 lb

Cat & Jack 3T 28.5 to 32 lb

Cat & Jack 4T 32.5 to 37 lb

Height (in)

Old Navy 3T 36.2 to 39 in

Cat & Jack 3T 36 to 38.5 in

Cat & Jack 4T 39 to 43 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 Cat & Jack chart.

More comparisons

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