Proceed for scheduled Vaccination or not

Hi. My 2 month old son is down with flu and cough for about a week. Is it advisable to proceed for his scheduled vaccination tomorrow at the polyclinic for DTap (D1), IPV (D1), Hib (D1)? I checked through HPB webpage and found that they mentioned under one of the point form "Immunisation is only given when a child is found to be fit". But because this is given during his 3 month mark and if postpone, the rest of the vaccines has to be push back as well.