20 week old dd generally good sleeper only really waking at night (usually once) for milk (ebf). Naps are pretty consistent in the day- 45mins in morning and 2-2.5 hours over lunch and sometimes a nap in the buggy if we are out about 4pm. She is able to self settle. I am aware of the 4 month sleep regression, however is there anything we could be doing that is contributing to her nighttime sleep being up the spout? I don't rush in at the slightest whimper and we haven't left her to cio. Nothing else has changed and she isn't teething. Co sleeping isn't really an option for us. ANY words of wisdom or shall I just sit tight? :-(