Subject: Why does the stomach of a fetal pig have anything in it?

Why does the stomach of a fetal pig have solid matter in it if it is 
getting all of its nutrients from its mother? We were dissecting fetal 
pigs today in Science, and one of the conclusion question was this 
question, and our teacher won't help us a bit, and I have looked for 
several hours without finding anything. We cut open the stomach, and 
there was a substance that was composed of greenish balls that looked 
sort of like algae, that were in a sort of clear gel.  I would 
appreciate any help you could give me immensely. Also, I would 
appreciate a very quick answer, because my deadline is tommorow.

Re: Why does the stomach of a fetal pig have anything in it?