I did the vicks on feet trick recently too. Honestly i would avoid antibiotics and let them ride it out naturally whenever possible. Most things are viral which anti-biotics do nothing for anyway. My friend says the Calpol plug ins are good for their little boy when hes congested as well.
Following My son has a lingering chesty cough after every virus he gets! We used to use baby vapour rub may upgrade to Vicks 👍🏻
Vicks vapour rub on feet with socks on! Works wonders for coughs :) I’ve used this on all mine when they’ve had colds x