Yes, in most cases.
Usually patients with a colostomy
have had part of their colon
The colon is responsible for reabsorbing water from the stool. If you have less colon, then you will reabsorb less water and your stool will be softer and less formed in character. If you are not having any other symptoms besides the mushy stools, don't be alarmed. See your doctor if you have other symptoms though.