They take some time that's it. Nothing to be worried about.

Trupti<br> They must be taken care of specially. But they do gain weight, and not required they have to be lean mommy. Don't worry about it

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They do gain weight but slowly. You have to take extra care. My nephew as highly premature but now he is a healthy and happy baby. Read this <a style="text-decoration:none" href="http://app.babychakra.com/article/1006"><b><font color="#3b5998">The Basics About a Premature Baby</font></b></a>