So STRANGE!

Not sure if anyone else out there is experiencing this or if it is just me but I have noticed since the twins have been born my hair isn't near as curly as it used to be and it gets oily fast.  I have always had curly hair and never had a problem with oiliness (I could go 3 days without washing my hair).  I straighten it or curl it with the iron everyday to get the look I want for that day.  Normally after a shower if I left my hair dry on its own it is extremely frizzy, big and curly.  Now it hardly has any curl and the frizz has tamed down bunches and it isn't big at all.  Did the hormones do it???  If not what happened?  Will it ever be curly again???  I am baffled!!!