Baby's head should be well supported and above the level of baby's stomach. Make sure your baby latches onto as much of the dark area around your nipple as possible. If you are anxious, this reflex may be slow to come. Always have water handy before you sit down to nurse. You may get thirsty.
Every baby is different.
Some eat quickly. Others take their time. Let your baby be your guide. Nurse often and get plenty of rest to help build up your milk supply. Your milk supply changes to meet your baby's needs.