Platipus - they start as boring eggs

Fuckin humans. Little alien potatoe mutant lookin infants geoss me the fuck out.

Pretty much all birds.

weasels. pictured, long tailed weasel mom carrying newborns https://www.inaturalist.org/observations/73859688

The aye-aye is weird-looking enough as an adult, but it looks like a Jim Henson creation as a baby.

Definitely humans. I mean, look at newborn babies. They are little wrinkly screaming poopgoblins.

Ladybug. The baby is a demon spawn made to eliminate aphid. It's good but not cute, it's metal.

Butterflies

Pretty much every bird

Stellars Jays spring to mind. One of the most beautifully punk-rock looking birds and worryingly intellegent, but my god their young look like nothing more than cancerous scrotums.

Birds and humans.

Also a lot of rodents, like mice, rats, etc.

Barn Owls all day long

Pandas and kangaroos come to mind immediately. Probably every marsupial would make the cut here too.