Its hard to tell as he could simply just be settling into feeding etc as he is so tiny still unfortunately I don't have any medical advice to offer but for your peace of mind don't hesitate to ring a parenting/child help line? Even ABA? Local GP? Or there is a free call to Health Direct Australia: 1800 022 222, simply for your peace of mind. I am sure he is perfectly fine, but like I said, mummies sometimes need that added reassurance. Thinking of you lovey, wish there was more I could do