My little girl is 7 weeks and seems to really enjoy hers
https://amzn.eu/d/5xX8Wwu We have this one x
Our little girl loved her play mat and then we upgraded to a piano gym around 12 weeks when she was more active/could interact with toys x
We have a baby Einstein and it’s good for those wake windows where he needs tiring out beyond just us chatting to him or using sensory cards. We also use it for tummy time - it’s probably a bit ‘early’ (2.5 weeks) in the grand scheme but can see us getting a lot of use out of it going forward.