Menstruation after birth

Hello mommies. Ask lang po, ilang months bumalik menstruation nyo after birth? Mix feeding si baby ko at almost 6 months na this June 7. Medyo nakaka paranoid lang baka buntis na dahil malaki tyan ko. Heheh *sana hindi*. 2nd baby ko na pala eto at sa 1st baby ko ay pag 2 months bumalik kaagad normal mens ko. Sana may makasagot para may peace of mind kami ni partner. Thank you.