My 11mths old baby keep falling sick every month, having high fever that will persist 5-7days. Could it be due to teething or is there anything I should be concern of? Thanks for ur precious feedback in advance.

I agreee with the post above that those are some point that you can check on. If its due to teething, then you should be seeing the teeth emerge yar? Also check the general hygiene and if baby is in contact with other children/sibling - they could be bringing the germs back too even if they themselves did not fall sick. Give baby more water and more rest when sick and i would choose to feed fruis or veg with more vitamin like broccoli