Earlier today, Notch Tweeted that baby animals have been added to the game, presumably to coincide with the new animal breeding mechanic in Minecraft beta 1.9.
So, there's that then. Look for baby animals when 1.9 officially releases, or when Team Mojang has another pre-release for 1.9.
Baby animals don't drop loot or xp, have a faster animation, and higher pitched sounds. Also, they eventually grow up.
So, there's that then. Look for baby animals when 1.9 officially releases, or when Team Mojang has another pre-release for 1.9.