Our daughter started at “nearly 3” (2 and 10 months I think) with private one-on-one lessons on the kindergarten slopes in The Dolomites. (She was too young for group lessons)
Lessons were only about an hour a day, so it wasn’t a dump-and-run option, but she loved them and got on really well.
The instructor said she was the youngest child she had ever taught but we were very pleased with how good she was with her. (My daughter can still remember her name when she watches the videos).
They were proper lessons – teaching her to ski, steer, go between flags, through little arches, up the magic carpet etc.
This year, as a nearly four year old, we had her in the big Neilson hotel in Les Deux Alpes.
If you are after some adult skiing time then that is a better option. They have kids clubs for all ages where they take them after breakfast and keep them till 4! * They do lots of snow-based activities and hook up with the ski school for those that are doing lessons. She had a great time at that and she was happily riding drag lifts and skiing down by herself by mid-week.
And we got fullish days of snowboarding in. Which was nice.
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* (before anyone gets sanctimonious about “dumping kids”: we only intended her to go for ski lessons, but when she found out about the kids club she insisted we let her do that too)