Evolutions in eggs
Evolution of the babies now available are still possible in eggs?
Answers
There is a brazilian guy who hatched a Pikachu on the 2km egg after the start of the event (and he got it on video, so yes). I don't know if it was something Niantic forgot to change, because it makes no sense for me to hatch both Pichu and Pikachu. Even less sense when you think that the baby one is on the 5km egg and the older on at 2km egg.
Otherwise, I've seen no Jigglypuff, Clefairy, Electabuzz, Jynx or Magmar being hatched. There are YouTubers who hatched more than 30 eggs after the kids thing started. Those Pokémon where not rare to hatch, so I think they got replaced by rare babies.
EDIT: The brazilian guy who hatched Pikachu got the egg before the event starts and only hatched it after. So ignore the first part. And I think that yes: they got replaced.