The Cutest (and Most Functional) Maternity Swimsuits That’ll Support Your Growing Bump

Can you wear a regular swimsuit while pregnant?

Yes! You can definitely wear a regular swimsuit while pregnant—especially during the first trimester. Your trusty string bikinis can easily be adjusted to fit the bump, and some one-pieces with ruching or ties can also transition from pre-pregnancy to pregnancy to postpartum. But if you’re finding that regular swimsuits feel uncomfortably tight or just don’t provide enough support for your growing belly, it’s probably time to purchase a soft, stretchy maternity swimsuit that’ll feel more secure.

When should I start wearing maternity swimsuits?

Keep in mind that all bodies and bumps are different, so there are no hard-and-fast rules when it comes to what you should or shouldn’t wear while pregnant! But most parents-to-be start showing during their second trimester, between 16 and 20 weeks, and wearing maternity swimsuits shortly after.

Should I wear a one-piece while pregnant?

You can wear a one-piece while pregnant, but you should wear whatever style of swimsuit you feel most comfortable in. One-pieces will provide the most all-over coverage, in addition to protecting your bump from the sun. Look for design details like adjustable shoulder straps, a tie-back, rushed sides, or ribbed fabric that’ll help one-pieces fit comfortably over your belly. On the contrary, if you want to show off that beautiful bump, opt for a two-piece! String bikinis, in particular, are a great option because they’re so adjustable.

Good news: This part isn’t as intimidating as it seems! If you’re shopping for maternity swimsuits, check out their size charts (v accurate). And fun fact: many of these brands have sizing based off of your pre-bump size. Maternity bathing suits are literally designed to grow along your body so you and bb feel comfy at all times.

Cosmo’s team of digital fashion experts—which includes Fashion Features Director Rachel Torgerson, Fashion Editor Tarah-Lynn Saint-Elien, Contributing Fashion Editor Maggie Griswold, Senior Shopping Editor Kim Duong, Associate Shopping Editor Hanna Flanagan, and Assistant Shopping Editor Megan Uy—have decades of combined experience in the industry. They spot relevant trends on the runway before they even hit your TikTok FYP or Insta Explore Page and conduct research across retailers of all kinds—testing many brands IRL—to bring you the best clothing and accessory picks for every season. Basically, we’ve curated the internet to bring you the chicest options like it’s our job (because it is, heh). Each of our shopping articles adheres to the 15 Percent Pledge and includes products for all sizes.

For this article, we primarily focused on the comfort and versatility of every suggested maternity swimsuit. That’s why you’ll find many options with adjustable straps and stretchy fabric, such as nylon and spandex. And of course, we scoured the internet for fun and unrestrictive styles so that every mama-to-be could find something just for them.