Ive been travelling with my son to and fro SG -MY since he was 25 days old till today, now he’s 13mth. I think it depends on the caregiver (for my case it’s me though i had c-sect) and the baby. So far my son had no problem during take off. And i feel it depends on the duration of the flight as well. For a 1 hr flight SG - MY, it’s short. My son sleeps during take offs and wakes up once the flight lands. I’ve yet to travel longer duration/route with him.