It's probably the only thing that can cheer up a tired, grumpy mom covered in spit-up and in desperate need of a shower. Babies often seem to instinctively know when a frazzled parent needs some comic relief and are happy to provide the toothless gums for it.

For some babies, it may take extra coaxing to be rewarded with an enthusiastic smile – others seem to be born more social. Whatever the case, many parents often find themselves exhibiting behaviors they never knew they possessed until their baby came along.

Here are 10 things that are sure to make your baby smile!

It's no secret that babies crave touch. Gently blowing raspberries on those tiny hands, feet and belly are the perfect way to make a baby smile. Before long, you'll realize how influential those raspberries were when your baby starts making the "razzing" sound on her own.

For some reason, like being on the receiving end of raspberries, most babies absolutely love it when a parent nibbles on their feet, fingers or neck. The love of nibbling often lasts well past infancy. Children as old as 2 even enjoy a good toe nibbling every now and then.

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