Baby is too small so visit the paediatrician. Since its already 3 weeks she can go for small walks, if she is keeping herself active she will recover fast.

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Take him to a doctor as he is very small. Let the mom take rest. Support her in all ways possible. Give her a good diet. <a style="text-decoration:none" href="http://app.babychakra.com/article/2663"><b><font color="#3b5998">Postpartum Diet - Best Foods to Eat After Having a Baby</font></b></a>