why my 7 month baby takes everything in his mouth?

A. it s normal and is due to teething teeth eruption signs are swollen gums , drooling saliva and a cranky baby . Massage baby gums by clean hands to help with pain and irritation relieve . Can use a teether for soothing baby . Give vitamin d3 800 IU then 0.5 ml or 400 IU 1 ml daily to baby from birth to one year of age for strong teeth and bones .