outdoor summer gear for 6-9 mo

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My DS will be 6 mo at end of May, so will be 6-9 mo throughout the summer.

What gear do you recommend for the outside for that age group? I have nothing. A little pool? Will he like swings at that age?

Relevant: fenced in backyard. Outside time will be hanging while parents do yard work, BBQ, and drink on patio I also walk the dog and anticipate taking DS along in stroller.

Also, what do I need to know about bug bite prevention?

TIA!