You are giving Tab. Zantac
daily for a mon. to 7 mon old child .....please do not give that.
Get you child examined by an ENT specialist
for ear infection
For urine you must get done Urine examination routine and microscopy and if there is infection then Urine culture can be done.
You must give your child mothers milk if possible and in between give him other food and slowly decrease the mother feeds and increase the top feeds.
Do not push too much for top feeds, the children are very choosy and they do not eat what they do not like.
Change the menu of food frequently.
If any further query do consult.
Get well soon.