"Under the Sea" summer baby romper features whimsical images of sea creatures  such as a whale with floaties and shark with a life-preserver. The romper is cream-colored and photographed on a soft blue background.
organic under the sea onesie. Baby wearing the under the sea onesie while sitting on the beach.
organic under the sea onesie. Baby wearing under the sea onesie and holding starfish rattle toy.
Close-up view of the "Under the Sea" baby romper showing a smiling red starfish, a clam wearing pearls and glasses, a peach puffer fish, a blue octopus with a snorkel, a blue-striped whale with floaties and a blue shark with a peach-striped life preserver.  Photographed on a soft blue background.
Machine washable soft baby toy rattles, knit clothes & gift sets.

Machine Wash

Handmade baby toys, clothes & gifts. Knit in Peru by local artisans.

Handmade Knits

Organic newborn gifts, toys & accessories by Estella.


Organic Baby One-Piece - Under the Sea

3 reviews
Regular price $42.00 Sale price$32.99 Save $9.01
We will include this message in your order along with a gift receipt that has no prices. You only need to include 1 message per order.
Add gift wrap for $6. One per order & gift wrap paper & box will exactly look like this

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Limited Time Offer: Free Baby Book on Orders $170+

Beach babies know that bliss begins when you're seaside. Let your favorite baby enjoy the warm weather with our soft and lovable "Under the Sea" summer romper.  Printed with whimsical images of sea creatures, our adorable romper is comfortable. practical and ready for long summer days.  Create the perfect baby gift set by pairing it with any of our sea-themed rattles and toys such as our octopus, starfish, whale, shark and surfboard!  

  • 100% certified organic cotton with safe, eco-friendly dyes
  • Machine wash, tumble dry low
  • Runs small, considering sizing up!
  • Leg and shoulder snaps for easy changing
  • Ethically made in Peru

Gift Receipt - Since most of our orders are gifts, we never include prices in our receipts. The receipts list what items purchased and quantities so that the recipient know what they are getting, but never the prices.

Gift Message - On the shopping cart, you can type in a gift message and we will print it and include it with the gift receipt.

Gift Wrap - You may purchase gift wrapping for $6 and will will wrap and box the gift for you.

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Same day delivery in Manhattan: For $35, we offer same day delivery in Manhattan on 86th street & below. We must receive the order before 2pm EST weekdays. Allow up to 4 hours for the messenger to deliver. If received during the weekend or after 2pm weekdays, the order will be delivered the next business day. There must be a recipient at the delivery address otherwise there will be a double fee for a redelivery attempt.

2 Business Day Shipping: We also offer 2 business day shipping for a flat rate of $25. These orders will NOT be delivered on weekends, they will only be delivered on weekdays. We prioritize these orders and work hard to get pick, pack and ship them as soon as possible.  These orders leave at 3pm EST every weekday. 

Next Business Day Delivery in NY, NJ & CT. We also offer next day business delivery to recipients in New York, New Jersey & Connecticut.  We prioritize these orders and work hard to pick, pack and ship them as soon as possible.  These orders leave at 3pm EST every weekday.  So, if an order is placed before 3pm EST on any weekday, it will be shipped the same day, otherwise it will ship the next business day.  Once shipped, it will arrive on the next business day. 

Free Domestic Shipping on orders $75+: We offer free USPS ground shipping on all U.S. orders $75 and up. Orders are processed before 3pm every weekday that is not a holiday, if an order is placed after 3pm, it will ship on the next business day. USPS ground shipments are usually delivered in 3-5 business days. That said, we cannot guarantee these transit times. While we offer USPS shipping, we are independent of them and cannot control their delivery schedule. Orders less than $75, we offer a flat rate of $5 for USPS ground shipping.

International Shipping: We ship internationally to most countries.  We offer real-time rates for international orders.  All rates are calculated at checkout where we also collect and pre-pay all applicable foreign duties or taxes.  Thus gift & package recipients will not be responsible for any international duties, fees or taxes.  However, please enter the correct shipping address.  Any undelivered items will be abandoned and Estella will not take responsibility for the package, nor will it be liable for the goods.  Kindly provide accurate postal shipping addresses.

We ship Monday-Friday, excluding National holidays.

Machine washable soft baby toy rattles, knit clothes & gift sets.

Machine Wash

Handmade baby toys, clothes & gifts. Knit in Peru by local artisans.

Handmade Knits

Organic newborn gifts, toys & accessories by Estella.


Why Estella?

Free Shipping & 30 Day Returns

We offer free shipping on orders $75+ & $5 ground shipping on all other orders. We also will fully refund you if you return your purchase unused within 30 days.

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Trusted Since 2001

Estella has been trusted in the industry for over 20 years. We have appeared in VogueEllePeopleVanity FairBuzzfeed & much more.

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Handmade & Organic

All our baby toys & clothes are made with certified organic cotton. This sustainable & safer for kids, the earth & workers. Plus, all our sweater knits are handmade.

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Customer Reviews
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Mary A.
United States United States


Great quality. Sending to my grandson in London.

Mallory B.
United States United States

fantastic gift

i gifted this to a client who recently had a baby and they loved it so much, they put it on him and sent me a photo and featured him on their instagram story in his new outfit. <3 will shop here for more gifts for clients/new moms in the future.

Heather C.
United States United States


Perfect for my 7 month old who just grew out of his 6 month clothing. Soft cotton. Cute print. Washes well!