4month old sleep pattern at night

My 4 month old make noise every night since last 3 weeks. Everytime about 1 hr after feed, she will make noise kick her legs, if I ignore she will end up crying or sometimes have coughing or choking sound, all these while her eyes are closed. Not sure why is this happening? I know that grunting sounds & making some noise is normal. But hers if ignored will escalate into crying and she will eventually wake up.