How can you tell what sex a baby guinea pig is?

okay it is very hard to explain the butthole of your piggy right above it gently push and if something pops out it is the males pennis and if nothing happens it is a female and you can take them away from they're mother at 5 weeks old but is male 4 weeks because i read it on google and i had 2 guinea pigs one male and one female and she ahad babies so i looked up on google how to tell the seex of your guinea pig i found out the 2 babies mine had were both girls hope this helps! Type this website in and find you will find out how to sex them, www.cavyspirit/sexinghtm