Cough medicine for 20 month old?

Michelle • Baby 💗 born 6/11/17 & 💗 born 8/27/19

My daughter has had a cough for the past week. She coughs a lot at night and it’s disrupting her sleep. I know cough medicine shouldn’t be given at her age. Is there anything natural or any medicine I don’t know about that I can give her? Thanks.