Baby coughing

My girl is 4 months old now. I realised off and on she will start having dry cough during playtime or simply lying down. It is not consistent, it will happen randomly and stopped after a few cough. Is this normal? This has been going on for a while (at least a few weeks) and I dont know if I should be worried if she has any infections. Can anyone please advise me? Thank you #firsttimemom #pleasehelp #firstbaby