This encourages her to open wide, suck, and swallow. As a general rule, you'll breast feed your newborn eight to twelve times per day. You don't want to let your baby get overly hungry, as he does not feed as well if you do. Sucking does not equal eating. Check to see if your baby, who is sucking away like mad, is actually swallowing.
Babies usually do some non-nutritive sucking.
Watch for this. Newborns usually suck one to three times, then swallow. Thus a new born who is sucking 15 minutes per breast, but not swallowing, is not receiving enough to eat and may need to breast feed 20 to 25 minutes per breast to get enough to eat. Be assured that you will produce enough milk. Breast milk contains chemicals call suppressor peptides.