Your tips/ hacks/ advice for 4 month old baby!

[Eryr22]

I've seen lots of threads like this but all catered towards newborns!

What are your tips/ hacks/ advice for 4 month old babies, and slightly older?!

I can barely remember this and only at 11 months now so maybe take videos?
(and realise this early stage flies past alarmingly fast!)
also don’t spend much money on anything as sizes etc change so fast. I bought everything like jumperoo second hand this time , there are loads of amazing things on Facebook etc