Baby Bodysuit Hack: Using Vest Extenders with Nappies

By LittleLamb | Published: 2026-10-17

Category: How-to Guides

Learn how to use a baby vest extender to make standard bodysuits fit over cloth nappies. A simple hack that saves money and keeps your baby comfortable.

Quick answer

A baby vest extender is a small fabric panel with poppers that clips between the bodysuit's bottom poppers, giving extra length to fit over bulky cloth nappies. This hack lets you use regular bodysuits without buying special nappy-friendly ones, though purpose-made designs like LittleLamb's Over the Fence Bodysuit already include a longer gusset and extra-wide leg cut.

Why standard bodysuits don't fit over cloth nappies

Standard baby bodysuits are cut for disposable nappies, which are much slimmer than modern reusable nappies. When you try to fasten the poppers over a cloth nappy, the bodysuit pulls tight across the crotch and shoulders, making your baby uncomfortable and causing the nappy to leak. A vest extender adds the missing length without altering the garment.

What to look for in a vest extender

Choose an extender made from soft, stretchy cotton that matches the weight of your bodysuits. Look for one with at least three popper positions so you can adjust the fit as your baby grows or as nappy bulk changes. Avoid plastic poppers that snap under tension; metal poppers last longer.

How to use a vest extender with a cloth nappy

Step 1: Attach the extender to the bodysuit: Lay the bodysuit flat and snap the extender's poppers onto the bottom row of the bodysuit's crotch poppers. Make sure the extender's fabric panel faces outward. Common mistake: attaching the extender upside down. The popper sockets should face away from the baby's skin.
Step 2: Dress your baby in the cloth nappy: Put on the reusable nappy as usual, ensuring it is snug but not too tight. The nappy should sit at the natural waistline. Checkpoint: if the nappy is too bulky, try a trimmer insert or a different fold to reduce bulk.
Step 3: Put on the bodysuit and fasten the extender: Pull the bodysuit over your baby's head (use the envelope neck if available). Bring the extender's free poppers down and snap them onto the front of the nappy or onto the bodysuit's bottom poppers, depending on the extender design. Common mistake: fastening the extender to the nappy itself. Most extenders are designed to snap onto the bodysuit's own poppers, not the nappy.
Step 4: Adjust for comfort and fit: Check that the bodysuit is not pulling at the shoulders or neck. The extender should add length without creating a gap. If the bodysuit still feels tight, move the extender to a longer popper setting. Checkpoint: if the bodysuit rides up, the extender may be too long. Try a shorter setting or a different extender size.
Step 5: Test the nappy seal: After dressing, gently press around the nappy legs and waist to ensure the bodysuit is not pushing the nappy out of place. A good fit means no gaps and no red marks on your baby's skin. Final verdict: if the nappy leaks or the bodysuit constantly rides up, consider a purpose-made bodysuit like the Over the Fence Bodysuit, which eliminates the need for an extender.

Product facts

Over the Fence Bodysuit - Designed for Reusable Nappies: LittleLamb's Over the Fence Bodysuit is made from organic cotton with a longer than usual gusset and extra-wide leg cut, designed specifically to fit over modern cloth nappies. If you prefer not to use an extender, this bodysuit already has the extra length built in, so you don't need any hack.