Circumcision of infant boys
Question

                Is it permissible to circumcise a baby boy
      before the age of seven days, especially when this is the practice in some hospitals?
      Someone told me that it is haraam (forbidden) to do this before seven days and makrooh
      (disliked) after that time.
Praise be to Allah.It is sunnah to circumcise baby boys, and it is neither haraam nor
    makrooh to bring it forward before the seventh day or to delay it. The ruling is not
    strict, and the interests of the child are to be taken into account. The Prophet 
    (peace and blessings of Allaah be upon him) said: “Five things are part of the fitrah
    (natural disposition of man): circumcision, shaving the pubic hair, cutting the moustache,
    cutting the nails and plucking the armpit hair.” (Saheeh: agreed upon).