I am feeding my 51/2 month old baby...she has been weaned but...?

ramadan is coming up..she doesnt take a bottle..she does require quiet a few feedings as mashAllah shes a big baby...is it obligatory on me to fast? i am trying to get her into the habit of taking a bottle so that i can give her tht from sahoor until iftar but she wont take it..help please.