Just wanted to chime in with all the rest - 4 months seems to be the age for it. DS had pretty rough sleep for quite a few months at about the same age, now it's variable but his day sleeps have really improved from 40min naps all day to 1.5-2.5hr sleeps most days. He's still waking overnight but it varies between 1-3 feeds (lately it's been 3 again ). I just keep reminding myself that sleep is developmental like everything else and that if I ride him out, do what works in the short term, he'll be sleeping through eventually.

There are some good books around if you're interested that use gentle methods to help promote sleep. I found these useful to give me other options and ideas and to educate me about what is a typical sleep pattern for babies (and it's not sleeping 10 hours straight which DS has hardly ever done so that made me feel better ).

You're doing a great job!