Pasty Butt in Chicks: Causes,Treatment & Prevention

Pasty Butt also known as pasted vent and pasting up is a condition that occurs in baby chicks when droppings stick to the down surrounding their vent. Poop builds up to form a blockage of the digestive system that can be fatal to the chick unless removed. Pasty butt treatment, causes and prevention are covered below.

Pasty Butt also known as pasted vent and pasting up is a condition that occurs in baby chicks when droppings stick to the down surrounding their vent. Poop builds up to form a blockage that can be fatal to the chicken unless removed. Causes, treatment and prevention are discussed below.

Chicken chick with pasted vent


All baby chicks have both vents and navels/belly buttons which should not be confused with one another.

Chick anatomy belly button vs vent

The vent is the orifice from which chickens pass bodily waste and from which hens pass eggs. The belly button is located just beneath the vent. Just as in human babies, after birth/hatch there is a small amount of tissue that must dry up and fall off the belly button. This dried tissue should not be confused with droppings and should never be pulled off as doing so could disembowel the chick.

Pasted vent in feed store chick
It is very common for chicks sold commercially to have pasty butt.


  • stress and being cold, most commonly seen in chicks shipped through the mail
  • over-heating, most often due to heat lamps
  • less common causes include viral or bacterial infections and improper diet, all of which can result in diarrhea
A more advanced case of pasty butt in a feed store chick.

All newly acquired chicks should be checked immediately upon arrival home. Those with pasted vents should be treated and monitored closely thereafter for recurrence.

Wash chick's butt in lukewarm running water.


I have found that the fastest and safest way to treat pasty butt is to wash the chick’s butt under lukewarm running water. Work quickly in a warm room to prevent chilling. When the droppings soften, gently coax the poop off the down without pulling to avoid tearing the chick’s skin.

After soaking to soften the droppings, gently coax them off the down without pulling.

Towel dry the chick, then use a hair dryer on low heat to dry the down completely. As you can see from the photo above, the vent is pink and obvious when wet, which would put the chick at risk of pecking from other chicks if returned to the brooder damp.

After towel drying the down, dry with a hair dryer on low heat.

If the chick has recurrent pasting up, petroleum jelly or triple antibiotic ointment can be applied to the down as a preventative. Steer clear of oils as they can become rancid.

Clean chick butt.

The Brinsea EcoGlow Brooder keeps chicks warm and happy without the risk of overheating.

Brinsea EcoGlow Brooder keeps chicks warm without overheating them.


  • Maintain proper brooder temperatures
  • Consider switching from heat lamps to a radiant heat source such as an EcoGlow brooder, which will eliminate the possibility of overheating chicks.
  • Add probiotics to the chicks’ water
  • If several chicks develop pasty butt after a few days in the brooder, it may be too hot and the temperature should be adjusted.
  • Don’t be in a hurry to offer treats to chicks. Always provide grit if offering any food other than starter feed. Grit can be sand, a clump of weeds with the root ball/dirt attached or crushed granite, which can be found in feed stores and online.
  • If pasty butt is recurrent The Chicken Health Handbook suggests offering some scrambled eggs mixed into the starter feed and if that clears things up, switch brands of feed.
Pasty Butt causes & solutions via The Chicken Chick®
Kathy Shea Mormino, The Chicken Chick®

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Mrs Joseph
Mrs Joseph
10 months ago

Very helpful

Kristy maggard
Kristy maggard
8 months ago

Thank u so much for the helpful information that gave me a great insight on alot of things!

Cami M
Cami M
4 months ago

Oh my gosh this was so helpful. Thank you! I thought my chicks were going to pass away because I thought they had pasty butt, but no, it was just a belly button.

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