I’ve never been but there’s a gym near Silverburn, Smart Gym that has a creche. Also worth checking out Absofit. Pre-baby I went to her outdoor fitness classes. She does mum and baby classes at Cambuslang park and also does group/1-2-1 PT sessions that you can take babies along to.
If your happy to drive I used to go MAWS at ferri fit they are based Motherwell way can take baby along ! Xx
Check if you have a sweaty mamas class near you. It’s a great class. They have one in Livingston but sure it’s part of a franchise.