Premature babies are babies born before 37 weeks. Some may think they're weaker and have little chance of surviving, but in reality, preemie babies are fighters. They are born already in the middle of a battle and they try their hardest to make it through. There is nothing sweeter than a baby's smile — except for maybe when a preemie smiles. Because when they smile, it shows that everything is going to be okay.

Here are 13 premature babies who are smiling simply because they're happy to be alive.

SHARE if you know a preemie baby!

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Born weighing only 2 lb 12 oz.

Facebook |  Audrey-Lindy Cheatham

Look at that beautiful smile!

Born at 33 weeks, her mother was told she'd never smile again after suffering a stroke.

Facebook |  Angela Soilleux

Her big grin just proved everyone wrong.

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He may not look like it, but this man was born nine weeks premature.

Facebook |  Jackie Penny

He weighed 4.8 lb. He will soon be graduating from med school to be a doctor of osteopathic medicine.

Born at 34 weeks and weighing 5 lb 4 oz.

Facebook |  Kate Hoffman

After two weeks in the NICU, this little guy is doing great!