Here are some pretty frightening first person reports, the first from the Daily Mai, the second from The Sun. The first URL relates one mother's story and it seems like her baby had a narrow escape - the turbulence started so quickly that the child initially wasn't attached to the mother but in the cot. Luckily the baby was not hurt and slept through the event.
https://www.dailymail.co.uk/news/art...ight-hell.html
https://www.thesun.co.uk/news/227258...-packed-brits/
The latter story seems to have had more input - at least unofficially - from BA, and reports 5 crew injured, with 2 of those being more minor. So the captain would not have had a choice but to land at SIN or KUL in terms of crewing levels.