Ay, depende talaga sa type ng treatment, mama! If it's just a trim or rebond, pwede na anytime kahit pregnant ka pa lang or breastfeeding, pero better consult your OB muna about the chemicals, lalo na kung gusto mo ng coloring or relaxing. A few of my mum friends waited till after delivery para sa major treatments, and some naman ay nag-rebond pa rin during pregnancy pero sa trusted salon lang with good ventilation, kaya siguro best timing is a few months postpartum when things have settled na?