Long Sleeve Navy Rash Guard - UPF 50+

Sizing varies a lot between children's brands, so the single most reliable guide is the size chart on each individual product page. The reference below covers how sizing generally works across the brands we carry at Shop Little Cousins.

Baby sizing (newborn – 36 months)

Baby clothing is sized by age in months. Most brands size up, meaning a garment labelled 6–12M is cut to fit a baby up to 12 months old.

• Preemie – up to about 5 lbs
• Newborn (NB) – about 5–8 lbs, up to 21.5"
• 0–3M / 3M – about 8–12 lbs, 21.5–24"
• 3–6M / 6M – about 12–16 lbs, 24–26.5"
• 6–12M / 12M – about 16–21 lbs, 26.5–29"
• 12–18M / 18M – about 21–24 lbs, 29–31"
• 18–24M / 24M – about 24–28 lbs, 31–33.5"

Toddler and kids sizing (2T – 10+)

After 24 months, sizing switches to numbered sizes. A "T" size (2T, 3T, 4T) is cut for a toddler still in diapers and is generally roomier through the hip than the equivalent numbered size.

• 2T / size 2 – about 2 years, 33–35"
• 3T / size 3 – about 3 years, 35–38"
• 4T / size 4 – about 4 years, 38–41"
• Size 5 – about 5 years, 41–44"
• Size 6 – about 6 years, 44–47"
• Size 7 – about 7 years, 47–50"
• Size 8 – about 8 years, 50–53"
• Size 10 – about 9–10 years, 53–56"

Brand notes

• European brands such as Mayoral are sized in months and years using European measurements and often run slimmer and longer than US brands. If your little one is between sizes, size up.
• Organic cotton and ribbed knits have more stretch and are more forgiving between sizes.
• Two-piece sets and pajamas are usually cut with growing room. Snug-fit sleepwear is intentionally close-fitting for safety and is not undersized.
• Maileg toys are sized by mouse size (Micro, Baby, Little, Big, Mum & Dad) rather than by clothing size — each product page lists the height in centimetres.

Still not sure?

Call or text us at 805.538.8408 or email hello@shoplittlecousins.com with your child's age, height and weight and we'll tell you what we'd pick. You can also come try things on at 6425 El Camino Real in Atascadero — we're open Monday through Saturday 10am–5pm and Sunday 11am–4pm.

Items can be exchanged for a different size within 30 days as long as they're unworn, unwashed, and still have tags. See Shipping & Returns for details.

All seasonal items are final sale. All sale items are final sale.

Accepts returns within 30 days of receipt for exchange or store credit only. Items being returned for exchange or store credit must be unworn, unwashed, with the tags still on the item. The following items are final sale and NOT returnable: hair accessories, furniture, personalized items, photo props, SALE items, seasonal items, and custom items. To initiate an exchange or return for store credit please email hello@shoplittlecousins.com.

If you receive an item that is damaged or defective you need to notify customer service via email at hello@shoplittlecousins.com within 10 days of receipt to file a claim. Please provide your order number and detailed photos and/or video of the defect. We are happy to help!

Shipping:

We offer free GROUND shipping on all US orders over $75. No code needed! Local pickup is available at our Atascadero store, usually ready within 24 hours.

After an order is placed, your items will be shipped in the next 1-3 business days.

You will be responsible for any return shipping costs. You will be responsible for shipping charges if a return is exchanged. Shipping charges will not be refunded.

Please note that processing delays in transit resulting from public holidays, severe weather, or courier transit errors are beyond our control. While we will make every effort to assist in resolving these issues, we are not responsible for lost, stolen packages, or packages delayed in transit.