My daughter is 26 days old and use to breast feed and top feed her, for top feed I use lactogen. During breast feed she feed for 10-15 minutes only and then sleeps and when I try to take her burp, she awakes and start crying and mostly did not give the burp and then again demand for feed and this continues. So, in night I give her formula milk so that her sleep won't get affected. She sleeps but she makes sound from mouth like eeehhhh....uuuuhhhh...we don't know why she do that, in noon when she sleeps she does not make any sound. Also please advise is it ok to give top feed to baby or it is not advisable....when I breast feed her she takes lot of time and want to stuck there only which is difficult to manage. Need your guidance