So far, I've taken our 1yo on a few flights. Weather has been good for VFR flights and I was careful to do slow climbs and descents. He's generally been good with pressure changes. I think earmuffs bug him more than the altitude changes. He mostly just sleeps and I've gone as high as 8000ft with no issues(he was asleep at the time). However, next one looks like it may be an IFR flight @9000ft, possibly higher. I'm thinking of putting "Baby onboard, request gradual altitude changes" in flight plan comments. Is that enough? Or should I mention it to one of the last controllers? Any other advice other than try to stay above the clouds(for turbulence reasons)? Besides potential ear issues, avoiding turbulence is my primary concern(wife hates them, baby doesn't care). Thanks.