Your dh is definitely right, she is only small and at this age they are often still quite random and will change quite rapidly. Although some babies will fall into or accept a routine easily many won't until around the 3 month mark or even 6 months when you start weaning. I like having a pattern to the day - sleep, feed, activity, sleep, etc but with mine I often had to work at the sleep bit and tried to avoid them crying. I love reading parenting books and take the bits I like and ignore the rest. I never really worried about how they got to sleep until they were nearly 1 and worked round any lack of sleep.
Would love some sleep advice from experienced mums! My baby is 7 weeks now. I think we are doing ok as definitely starting to see some day/night differentiation, however in the last week she has got a lot harder to settle for naps. She naps fab in a sling but then starting reading sleep advice online and got myself worried that this means she will be sleeping in a sling until she is 10! Husband keeps saying she is still small don't panic but he doesn't have to be here with the screams! Is my first post so hope not too waffly!