Brand vs brand

Cloud Island vs Primary sizes

Of Cloud Island's 8 baby and toddler sizes, 1 line up closely with a Primary size, 7 are partial matches, and 0 have no clean match. Both charts list weight and height, so the comparison uses both.

Closest pairs: Cloud Island 0-3M = Primary 0-3M.

Watch the labels: Cloud Island Newborn is closer to Primary Newborn than to Primary's own Newborn; Cloud Island 0-3M is closer to Primary 0-3M than to Primary's own 0-3M; Cloud Island 3-6M is closer to Primary 3-6M than to Primary's own 3-6M.

Cloud Island 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)

Cloud Island

Preemie: up to 5.5 lb
Newborn: 6 to 8.5 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

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)

Cloud Island

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

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

Cloud Island size to Primary size

Cloud Island	Closest Primary	Match	Weight: Cloud Island / Primary	Height: Cloud Island / Primary
Preemie	Newborn	Partial	up to 5.5 lb / 5.1 to 9 lb	up to 17.5 in / up to 18.1 in
Newborn	Newborn	Partial	6 to 8.5 lb / 5.1 to 9 lb	18 to 20 in / up to 18.1 in
0-3M	0-3M	Close match	9 to 12 lb / 9 to 11.9 lb	20.5 to 23.5 in / 18.1 to 22.8 in
3-6M	3-6M	Partial	12.5 to 16 lb / 11.9 to 15 lb	24 to 25.5 in / 22.8 to 25.2 in
6-9M	6-9M	Partial	16.5 to 19.5 lb / 15 to 18.1 lb	26 to 27.5 in / 25.2 to 27.2 in
12M	9-12M	Partial	20 to 23 lb / 18.1 to 22 lb	28 to 30.5 in / 27.2 to 29.1 in
18M	18-24M	Partial	23.5 to 26 lb / 26.9 to 30 lb	31 to 32.5 in / 31.1 to 33.1 in
24M	2	Partial	26.5 to 28 lb / 30 to 33.1 lb	33 to 35.5 in / 33.1 to 35 in

Primary size to Cloud Island size

Primary	Closest Cloud Island	Match	Weight: Primary / Cloud Island	Height: Primary / Cloud Island
Newborn	Newborn	Partial	5.1 to 9 lb / 6 to 8.5 lb	up to 18.1 in / 18 to 20 in
0-3M	0-3M	Close match	9 to 11.9 lb / 9 to 12 lb	18.1 to 22.8 in / 20.5 to 23.5 in
3-6M	3-6M	Partial	11.9 to 15 lb / 12.5 to 16 lb	22.8 to 25.2 in / 24 to 25.5 in
6-9M	6-9M	Partial	15 to 18.1 lb / 16.5 to 19.5 lb	25.2 to 27.2 in / 26 to 27.5 in
6-12M	6-9M	Partial	15 to 22 lb / 16.5 to 19.5 lb	25.2 to 29.1 in / 26 to 27.5 in
9-12M	12M	Partial	18.1 to 22 lb / 20 to 23 lb	27.2 to 29.1 in / 28 to 30.5 in
12-18M	12M	Partial	22 to 26.9 lb / 20 to 23 lb	29.1 to 31.1 in / 28 to 30.5 in
18-24M	18M	Partial	26.9 to 30 lb / 23.5 to 26 lb	31.1 to 33.1 in / 31 to 32.5 in
2	24M	Partial	30 to 33.1 lb / 26.5 to 28 lb	33.1 to 35 in / 33 to 35.5 in
3	24M	No clean match	33.1 to 35.9 lb / 26.5 to 28 lb	35 to 38.2 in / 33 to 35.5 in
4	None	No clean match	35.9 to 39.9 lb / n/a	38.2 to 40.9 in / n/a

Try it

Compare any size

I know the size in

Size

What is that in

Every Cloud Island size in Primary

Close match

Cloud Island 0-3M lines up closely with Primary 0-3M.

Weight (lb)

Cloud Island 0-3M 9 to 12 lb

Primary Newborn 5.1 to 9 lb

Primary 0-3M 9 to 11.9 lb

Primary 3-6M 11.9 to 15 lb

Height (in)

Cloud Island 0-3M 20.5 to 23.5 in

Primary Newborn up to 18.1 in

Primary 0-3M 18.1 to 22.8 in

Primary 3-6M 22.8 to 25.2 in

The shaded column is the Cloud Island range. Bars show what each brand publishes for the size.

Based on published size charts. Cloud Island chart and Primary chart.

More comparisons

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