My 12 week old baby had issues feeding, was very gassy, tongue tied etc. during the first 8-9 weeks of her life! So we didn’t push tummy time (any kind) too much on her. Now we are trying to be more consistent. However, it seems like she is hating even the kinds that she used to tolerate before- lying tummy to tummy on us, elevated, superman etc. Is 2 months to start tummy time? Is she going to be behind developmentally?