They are all so different! My friend's newborn BFs for 45 mins at a time, my LO was like yours and would be finished after 10-15 mins. When you think he's done, give him a burp and try again, sometimes the burp makes a little room for some more
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Little ones this young really can't last much more than 60-75 mins awake - that includes feeding time - so look out for a yawn at around 45 mins, or start your wind-down at about 50 mins even if you haven't spotted a tired sign yet! At this age there's very little chance of them being undertired