We have had our first day home with our little girl who was born on wednesday. She seems to be latching ok but suckles for ages and then fusses, rooting and knawing her hands like she is hungry. She wont suck on my finger. I cant seem to express much colostrum and Im worried she is starving/dehyrated. All her nappies are full of muconium but cant tell if she is passing urine. Should I give her formula?