Thanks for writing to health care magic.
This is the time when babies get all these problems. This is because till 6 months most of the babies are exclusively breast fed and do not have any problem.
The problem could be because of infections which arise because of improper sterilization
of the utensils etc we use.
Start one new item per week so that we can identify if a particular substance is causing allergy
and then we can stop it.
Hope this helps