I have a week old baby. She is completely formula fed and has not done a poo in about 3 days. I have phoned the midwives and they don't seem worried at all and have told me to try baby massage to see if it helps. I am also a bit concerned as she is taking about 4oz every 3/4 hours. We had her on 3oz however she was continually looking for more. Am I overfeeding her? She never puts up her milk.