Probably a hungry baby,or too gaseous. Try seeing if the latch is correct and burp after every feed!

U have been suggested great articles, burping is very important after each feed, sometimes it's a phase too it will be fine in a few days

Pls also read & bookmark this compilation of questions asked by new moms which have been answered by experts and other moms in detail. Very helpful for new moms like you! https://www.babychakra.com/learn/3096-new-mommy-questions-answered

U can massage head and legs gently.

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