I have been trying for the last 3 days to introduce my 3 5week olds to the 2 15 week olds...it is not going well at all...the big girls r being so mean..they r like in high school. My mom is trying to introduce 2 5 week olds to 3 15 week olds too...not going well there either...would it be easiler to take her 3 15 week olds and introduce them to my 2 15 week olds and keep all the 5 week old girls together..i'm actually losing sleep over this. My mom put a milk crate over one of the 15 week olds that was being very fresh..seems cruel..but is a good idea?