Brand vs brand

Little Sleepies vs Nike sizes

Of Little Sleepies' 10 baby and toddler sizes, 1 line up closely with a Nike size, 8 are partial matches, and 1 has no clean match. Both charts list weight and height, so the comparison uses both.

Closest pairs: Little Sleepies 3T = Nike 3T.

Watch the labels: Little Sleepies 2T is closer to Nike 24M than to Nike's own 2T.

Little Sleepies 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)

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

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)

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

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

Little Sleepies size to Nike size

Little Sleepies	Closest Nike	Match	Weight: Little Sleepies / Nike	Height: Little Sleepies / Nike
Preemie	None	No clean match	up to 5 lb / n/a	up to 18 in / n/a
Newborn	Newborn/0-3M	Partial	5 to 8 lb / 6 to 9.5 lb	18 to 21 in / 19.7 to 22 in
0-3M	3M	Partial	8 to 12 lb / 9.9 to 14.6 lb	21 to 23 in / 22 to 24.4 in
3-6M	6M	Partial	12 to 17 lb / 15 to 17.9 lb	23 to 27 in / 24.4 to 26.8 in
6-12M	9M	Partial	17 to 23 lb / 18.3 to 22 lb	27 to 31 in / 26.8 to 29.1 in
12-18M	12M	Partial	23 to 26 lb / 22.5 to 24.9 lb	31 to 33 in / 29.1 to 31.5 in
18-24M	18M	Partial	26 to 30 lb / 25.6 to 28 lb	33 to 34.5 in / 31.5 to 33.9 in
2T	24M	Partial	29 to 31 lb / 28.4 to 30 lb	33 to 36 in / 33.9 to 36.2 in
3T	3T	Close match	31 to 35 lb / 30.4 to 33.1 lb	36 to 39 in / 36.2 to 38.6 in
4T	4T	Partial	35 to 39 lb / 34 to 37.9 lb	39 to 42 in / 38.6 to 40.9 in

Nike size to Little Sleepies size

Nike	Closest Little Sleepies	Match	Weight: Nike / Little Sleepies	Height: Nike / Little Sleepies
Newborn/0-3M	Newborn	Partial	6 to 9.5 lb / 5 to 8 lb	19.7 to 22 in / 18 to 21 in
3M	3-6M	Partial	9.9 to 14.6 lb / 12 to 17 lb	22 to 24.4 in / 23 to 27 in
6M	3-6M	Partial	15 to 17.9 lb / 12 to 17 lb	24.4 to 26.8 in / 23 to 27 in
9M	6-12M	Partial	18.3 to 22 lb / 17 to 23 lb	26.8 to 29.1 in / 27 to 31 in
12M	12-18M	Partial	22.5 to 24.9 lb / 23 to 26 lb	29.1 to 31.5 in / 31 to 33 in
18M	18-24M	Partial	25.6 to 28 lb / 26 to 30 lb	31.5 to 33.9 in / 33 to 34.5 in
24M	2T	Partial	28.4 to 30 lb / 29 to 31 lb	33.9 to 36.2 in / 33 to 36 in
2T	2T	Partial	28.4 to 30 lb / 29 to 31 lb	33.9 to 36.2 in / 33 to 36 in
3T	3T	Close match	30.4 to 33.1 lb / 31 to 35 lb	36.2 to 38.6 in / 36 to 39 in
4T	4T	Partial	34 to 37.9 lb / 35 to 39 lb	38.6 to 40.9 in / 39 to 42 in

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Every Little Sleepies size in Nike

Close match

Little Sleepies 3T lines up closely with Nike 3T.

Weight (lb)

Little Sleepies 3T 31 to 35 lb

Nike 24M 28.4 to 30 lb

Nike 3T 30.4 to 33.1 lb

Nike 4T 34 to 37.9 lb

Height (in)

Little Sleepies 3T 36 to 39 in

Nike 24M 33.9 to 36.2 in

Nike 3T 36.2 to 38.6 in

Nike 4T 38.6 to 40.9 in

The shaded column is the Little Sleepies range. Bars show what each brand publishes for the size.

Based on published size charts. Little Sleepies chart and Nike chart.

More comparisons

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