It starts about 4mon after birth, and last almost 2 mon. Nothing is really helpful! But you could try sth might help you get this period shorter:
1. Never be nervous.
2. Try some gentle shampoo, organic shampoo is better.
3. Mix some rosemary essense oil together with your shampoo, it is said to be useful. I tried it, and I think it helps a little bit.
4. don't color, perm, or even straighten your hair at this moment.
5. eat more nuts.
6.comb your hair frequently but gently!