you can try momshie vitamins like PedZinc
Vitamin C +Zinc, to increase the immune system while zinc helps to harden stools lalo na s nagtatae...lalo na s mga nag-antibiotic w/c is nkkpagtae... you can even give some drinks na yakult that helps in digestion make sure to control ung intake kc matamis...ppwede i-dilute mo konti s water... it helps also to increase their immunity thru digestion... Kung UTI Yan ppwede buko or cranberry isama s diet nila... pneumonia...I think vaccine helps...or bka need niu to survey your house...bka mausok, maalikabok,or any related sickness pertains to respiratory kya nagkakapneumonia c baby...
better talk to your pedia pneumologist for overall assessment and intervention