Brand vs brand

Cat & Jack vs Little Sleepies sizes

Of Cat & Jack's 11 baby and toddler sizes, 3 line up closely with a Little Sleepies size, 7 are partial matches, and 1 has no clean match. Both charts list weight and height, so the comparison uses both.

Closest pairs: Cat & Jack Newborn = Little Sleepies Newborn, Cat & Jack 0-3M = Little Sleepies 0-3M, Cat & Jack 18M = Little Sleepies 12-18M.

Watch the labels: Cat & Jack 0-3M is closer to Little Sleepies 0-3M than to Little Sleepies' own 0-3M; Cat & Jack 3-6M is closer to Little Sleepies 3-6M than to Little Sleepies' own 3-6M; Cat & Jack 2T is closer to Little Sleepies 18-24M than to Little Sleepies' own 2T.

Cat & Jack True to sizeLittle Sleepies 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)

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

Little Sleepies

Preemie: up to 5 lb
Newborn: 5 to 8 lb
0-3M: 8 to 12 lb
3-6M: 12 to 17 lb
6-12M: 17 to 23 lb
12-18M: 23 to 26 lb
18-24M: 26 to 30 lb
2T: 29 to 31 lb
3T: 31 to 35 lb
4T: 35 to 39 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

Little Sleepies

Preemie: up to 18 in
Newborn: 18 to 21 in
0-3M: 21 to 23 in
3-6M: 23 to 27 in
6-12M: 27 to 31 in
12-18M: 31 to 33 in
18-24M: 33 to 34.5 in
2T: 33 to 36 in
3T: 36 to 39 in
4T: 39 to 42 in

Cat & Jack size to Little Sleepies size

Cat & Jack	Closest Little Sleepies	Match	Weight: Cat & Jack / Little Sleepies	Height: Cat & Jack / Little Sleepies
Preemie	Preemie	Partial	up to 5.5 lb / up to 5 lb	up to 17.5 in / up to 18 in
Newborn	Newborn	Close match	6 to 8 lb / 5 to 8 lb	18 to 20 in / 18 to 21 in
0-3M	0-3M	Close match	9 to 12 lb / 8 to 12 lb	20.5 to 23.5 in / 21 to 23 in
3-6M	3-6M	Partial	12.5 to 16 lb / 12 to 17 lb	24 to 25.5 in / 23 to 27 in
6-9M	6-12M	No clean match	16.5 to 19.5 lb / 17 to 23 lb	26 to 27.5 in / 27 to 31 in
12M	6-12M	Partial	20 to 23 lb / 17 to 23 lb	28 to 30.5 in / 27 to 31 in
18M	12-18M	Close match	23.5 to 26 lb / 23 to 26 lb	31 to 32.5 in / 31 to 33 in
24M	18-24M	Partial	26.5 to 28 lb / 26 to 30 lb	33 to 35.5 in / 33 to 34.5 in
2T	18-24M	Partial	26.5 to 28 lb / 26 to 30 lb	33 to 35.5 in / 33 to 34.5 in
3T	3T	Partial	28.5 to 32 lb / 31 to 35 lb	36 to 38.5 in / 36 to 39 in
4T	4T	Partial	32.5 to 37 lb / 35 to 39 lb	39 to 43 in / 39 to 42 in

Little Sleepies size to Cat & Jack size

Little Sleepies	Closest Cat & Jack	Match	Weight: Little Sleepies / Cat & Jack	Height: Little Sleepies / Cat & Jack
Preemie	Preemie	Partial	up to 5 lb / up to 5.5 lb	up to 18 in / up to 17.5 in
Newborn	Newborn	Close match	5 to 8 lb / 6 to 8 lb	18 to 21 in / 18 to 20 in
0-3M	0-3M	Close match	8 to 12 lb / 9 to 12 lb	21 to 23 in / 20.5 to 23.5 in
3-6M	3-6M	Partial	12 to 17 lb / 12.5 to 16 lb	23 to 27 in / 24 to 25.5 in
6-12M	12M	Partial	17 to 23 lb / 20 to 23 lb	27 to 31 in / 28 to 30.5 in
12-18M	18M	Close match	23 to 26 lb / 23.5 to 26 lb	31 to 33 in / 31 to 32.5 in
18-24M	24M	Partial	26 to 30 lb / 26.5 to 28 lb	33 to 34.5 in / 33 to 35.5 in
2T	24M	Partial	29 to 31 lb / 26.5 to 28 lb	33 to 36 in / 33 to 35.5 in
3T	3T	Partial	31 to 35 lb / 28.5 to 32 lb	36 to 39 in / 36 to 38.5 in
4T	4T	Partial	35 to 39 lb / 32.5 to 37 lb	39 to 42 in / 39 to 43 in

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Size

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Every Cat & Jack size in Little Sleepies

Close match

Cat & Jack Newborn lines up closely with Little Sleepies Newborn.

Weight (lb)

Cat & Jack Newborn 6 to 8 lb

Little Sleepies Newborn 5 to 8 lb

Height (in)

Cat & Jack Newborn 18 to 20 in

Little Sleepies Newborn 18 to 21 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 Little Sleepies chart.

More comparisons

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