Breech baby

I am 23 weeks and 6 days pregnant with twin girls. Baby A has been in a head down position for the whole 23 weeks until I went to the doctors she has flipped and is now breech and baby B has been breeched the whole time. I felt baby a completely flip and it was such a weird but amazing feeling. Anyone else having the problem of a breech baby or babies? Is there anything I can do to help make them flip?