1/ Discovering the snow and looking at snowflakes
Is this the first time your baby has seen the snow? This is already a great experience in and of itself! Let them find out what it's about: making their own marks, the sound of their footsteps, the texture of the snow... It's cold, it’s surprising - that in itself should keep them occupied for a little while!
If the children are a little older you can get them to look at snowflakes with a magnifying glass. They will be fascinated (for a few minutes) by their varied shapes and the beauty of these little ice crystals.
And for all the little ones, having fun outside is important for developing their curiosity and giving them a change of scenery, in particular. So do not hesitate to get them to do activities in the snow provided they have the right gear!