I took my son on flight to Jakarta when he was 2 months old. I think it's ok as long as your baby is healthy.
the airline provide bassinet for baby comfort.
Yup, so long the baby is healthy it can be done. We took our daughter back to Perth when she was +2 months old and it was Spring time last year and it was raining most of the time when we were there and the temp was around 8 deg on average every night and she was ok with it.