I just had my second baby in 2 years. he was born on Oct 21st.
after my first son was born, a lot of my hair fell out. it got much thinner but did not really lose the curl,after 6 months or so it started to grow back in fully again and went back to the way it was before the pregnancy. This time I do not seem to be shedding as much. my hair is still curly. I think the fact that I do the CG routine and it is healthier/more moisture is helping.
Hormones definately can cause changes in your hair. I actually had wavy-straight hair until I reached adolescence. at 13-14 my hair turned into the 3a it still is today.