"Softer and not itchy like the ones in the hospital." -Babylist mommy reviewer

Two soft-stretch boy-short panties, designed with light compression technology.


$19.98 $15.99

A must-add to your hospital bag. Our pair of soft stretch boy shorts offer light compression. Receive the comfort you'll need to cradle postpartum pads.

Size: S/M, LG/XL
SKU: FPPUSM197644491100
Availability: In Stock Pre order Out of stock

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$19.98 $15.99
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When a thong just won't suffice, Fourth Phase PostUndi postpartum boy shorts offer style, comfort, and extra support after childbirth. Post-birth you'll experience Lochia, a heavy vaginal discharge that contains blood, mucus, and uterine tissue. It will be a heavier flow than you're used to, and will typically last for four to six weeks. That's where PostUndi comes in.

Each pouch includes two soft-stretch boy-short panties, designed with light compression technology to hug curves and postpartum pads, helping you feel more comfortable and secure while you heal.

How To Use

Wear daily. Wash in cool water. Tumble or air dry. Do not dry clean.


Made of lightweight, stretchable, breathable cotton and mesh.

How We Give Back

Fourth Phase is a social impact maternal wellness brand with a mission to connect moms globally. A percentage of each purchase allows us to donate similar afterbirth care products to unhoused new mothers in the U.S., and underserved mothers in sub-Saharan Africa, via our charitable partners. Learn more on our Mom 2 Mom page.

Shipping and Return

Shipping + Ordering
Your Fourth Phase box order will ship via USPS. As soon as your box is sent you’ll receive an email with your tracking number. All packages are delivered without signature confirmation. Rush delivery is available within the checkout process for an additional fee. 

Orders received between Monday and Friday are usually processed the same day or by the close of business the following day. Orders received on the weekends are usually processed by end of day Monday. 

Mode of Payments 
We accept payments via Visa/Master credit and debit cards American Express, and PayPal. We do not accept payments via ATM or inter-bank transfers.

Return Policy

All sales are final. Not to worry, you’re going to LOVE it. However, if not just email


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