My daughter is 17 wks old and about 2 weeks ago decided she would no longer take a bottle from my husband anymore. He has been giving one to her every night since she was 2 wks old - she never experienced any nipple confusion. I tried introducing different bottles and medium flow nipples but she just turns her head toward whoever is trying to feed here's chest and cries and cries. I am giving it a couple of days and then trying the new medella calma nipple. I have to go back to work soon and I am getting anxious!