Is it bad if my five year old has pinworms and i have an infant not even a week old yet how could this effect him ?

Pinworms: Enterobius vermicularis is a colonic intestinal parasite that is incredibly easy to spread among multiple family members. Treating everybody simultaneously and laundering any clothing and bedclothing likely to have become contaiminated is the best way to manage this. See your pediaticain. There are otc meds available but i cannot vouch for their efficacy.