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Chicken Diaper Size Guide
Sizing is the one thing worth getting right the first time. Find your chicken's breed below, or send me a photo of your bird (with something in the background for scale) plus its breed and weight, and I'll recommend a size for you.
| Diaper Size | Chicken Size | Typical Breeds | Typical Weight |
|---|---|---|---|
| Chicken XS / Small |
Bantam-sized (Larger bantams size up to L) |
Sebright Bantam, Miniature Silkie, some Seramas, Modena Pigeons (too big for Serama) |
1-2 lbs (0.5-0.9 kg) |
| Chicken Medium | Bantams, Bantam Silkie, Bantam Ayam, Bantam Leghorn, Bantam Polish, Bantam Sumatra, Bantam Old English, Bantam Modern Game, Bantam Ameraucana, Bantam Ancona, Runt Pigeons |
2–2.5 lbs |
|
|
Chicken Large (Standard) |
Standard-sized | Larger bantams, Standard-sized Silkie, Ameraucana, Ancona, Andalusian, Australorp, Ayam, Brahma, Buckeye, Cochin, Cornish, Delaware, Frizzle, Holland, Jersey, Leghorn, Modern Game, New Hampshire Red, Old English, Orpington, Plymouth Rock, Polish, Rhode Island, Sumatra, Sussex, Wyandotte |
2.5–9 lbs |
| Chicken XL | Larger chickens — larger Brahma, Cochin, Jersey, Orpington, Plymouth Rock | 9+ lbs (4+ kg) |
|
| Chicken XL+ |
Cornish Cross, wider/rounder-chested Brahmas and Cochins. (XL+ is the same length as XL, but with a wider poop pouch and a wider chest bib) |
9+ lbs (4+ kg) |
Not sure which size?
- Bantam chickens are usually Small or Medium. Sebright bantams and miniature silkies typically wear Small; bantam silkies typically wear Medium.
- Rescue chickens of unknown breed around 5 lbs are usually Large. Rounder birds may need XL.
- Standard-sized baby chicks can start in S or M, but they grow fast — most need a Large by 8–12 weeks.
- Between two sizes? Size up. A slightly loose diaper works; a tight one doesn't. If needed, you can fold the chest bib down and pin in place to shorten the length of the diaper.
How to check the fit
- The Uni Infinity logo on the chest fabric should sit just below your chicken's crop. If it falls between the legs, size up.
- The poop pouch should fully cover the vent. If it doesn't, size up.
- Straps should feel snug but not tight, resting in the shoulder joint without restricting wing movement. If even the loosest setting is too tight, strap extenders are available.
Still unsure? Email me a photo of your chicken with its breed and weight, and I'll pick the size for you. Exchanges within the USA are always free.