Active babies

Gynae injected steriods to help babies' lungs to mature, in case I go into pre-term delivery. I suspect it wasn't just their lungs that developed quickly. The injections were supposed to take effect in 48hrs and during these period, the babies got into some growth spurt too and was very "high". Their movements became very strong and painful, went on non-stop for 2 days and nights. It just felt like they were having one great dance party in my tummy.