When my daughter was a couple of months old, she would get fussy if we were in the house too long. I think she needed a change of scenery. We took three or four short walks a day.
Sing songs to him, read books (I read him a Michael Crichton book), make up games...and this site has some other ideas, Productive Parenting: https://www.productiveparenting.com/
We read stories, do tummy time, go on walks (during naptime, weather permitting), and he lies under one of his 3 mobiles (on activity mat, pnp, and a light-up developmental one on his crib) a lot. He loves them!
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We do a lot of the normal stuff. Read books, listen to music, do nursery rhymes with her laying on my lap, etc. Lately she seem to be fascinated by just watching DH or I do things around the house so I just put her bouncy in whatever room I'm in and talk to her while I do things (I think it is mostly the noises that interest her--faucet running, hamburger frying, etc)
Re: What do you do everyday?
Someone posted this website the other day that I think has some great ideas.
https://www.fisher-price.com/fp.aspx?st=2320&e=activities&ctypecode=np&ccat=play_and_learn&cminAge=0&cmaxAge=3