It can take them a while to locate mom's teat, and when they do,- they usually only take a sip or two at a time at first.. But if the baby is getting tired and laying down, you can express some of moms milk, and put it in a syringe to give it to her.. Careful to give it to her slowly, so she doesent choke. She will get renewed strength to try to nurse again, once she has had some milk this way.. you can keep doing this, every 15-30 minutes until she can do it on her own. You can also help the baby position herself to assist her in getting at moms teat.