My hair has also been different since #3 .He's 4 now and it really has just stopped breaking and started growing. I wore it straight all last winter because it just looked awful natural. Two winters before, I cut it and she cut the layers too short; I had too much volume on top and not enough throughout unless I wore it straight. I also had/ am having a much much harder time losing weight... so I don't know if the 2 are related to each other, to hormones, or to age (iirc, we are around the same age).
I am finally seeing some improvement though, it's just taken longer this time around.