I found little maggot like parasite in my daughters poop. What is it? She's 11 months old?

It's about a quarter of an inch in length and round. Kinda fat. but it's translucent in color. It looks like it's filled with water or some other liquid and I can see what looks like air bubbles inside it. One end comes to a tiny little tip that's black. My mother was thinking that it was from a tiny piece of sausage she had earlier in the week, what could it be?