...when I rock him or feed him to sleep rather than when I actually manage to get him to sleep on his own?
He's 3 months and seeing as he hasn't managed to find his own routine, I'm trying the same routine I managed with dd (loosely based on GF, but without the nasty bits and without the absolute rigidity). To get him to sleep I use a variation on the pick up/put down thing in which I rock a little, stroke him and shush him instead of picking him up (because picking him up doesn't work). He won't take a dummy as dd did. But if that works then he only sleeps half an hour in the daytime, or about 2 hours at night, where if I keep rocking or feeding until he is sound asleep he will sleep a lot longer.
Anyone know why that would be?