Babies bred have various skins

Looks like you're right on the border between a plains biome and a swamp biome. Can you check whether the breeder is completely in the swamp biome? (You can use the biome blend option in the video settings, or the F3 screen for that).

I did check the F3 screen, and all blocks, even the adjacent ones, said swamp biome.  I did another test with jungle villagers, using the same parameters, but further into the jungle.  about a 30 second video. https://youtu.be/yCEt-R1vOBk

Duplicate of MC-150520