My baby girl is 6 weeks old. she has learnt to lift and turn her head during tummy time on week 5 and is now trying to lift herself up (of course she's unable to do so) and move like a lil turtle. I'm not sure if I should encourage this (she's still so young) or should I stop tummy time for the time being?

Congrats on ur LO's milestone. She is certainly a fast learner. At this age, she is probably v excited as she has learnt new tricks (flip, lift and move). She is at exploratory stage which is good. However, do be mindful that she should not be on her tummy time for too long (more than 10 mins) as she is using her arms' strength to support her body which can be tiring. I will suggest for you to monitor her as if she is overly tired on her arms, she will lose the balance and face flatten on ground. This can be dangerous as she might suffocate.

It's ok to continue tummy time so long as there is always people with her. As she just learn to lift her head, just b very careful. Keep yr eyes on her.