Don’t put him in the walker until he can sit up unsupported momma,

He will get there ❤️ have you tried taking him around other babies close in age it really helps the day my daughter sat up on her own was when we went to my neighbors their baby is a week older an she was sitting up an crawling an addilynn started sitting up while we were at her house !

Just keep playing with him and doing everything you’re doing he will get there ❤️ there’s YouTube videos of baby exercises that help, they didn’t personally help addi but all babies are different you could try it 😊 don’t beat yourself up over it !!!

You have nothing to worry about. Some babies just take longer than others because of no interest in doing those things. I'm sure he'll try to be on the go before you know it!