I changed the day of my PC to October 31st and the Baby Zombies have a pumpking over the head.
MC-30775
Baby Zombies with pumpkin in head
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Working as intended. This was coded into zombies so that on Holloween Zombies can have pumpkins or jackolanterns on there heads (cause its halloween)
Look at the Trivia on the wiki (about 14 bullet points down)
http://www.minecraftwiki.net/wiki/Zombies