Babies in the womb can become sensitised to substances, especially foods. Research has shown that antibodies can cross the placenta between 12 and 14 weeks. Not all of these antibodies develop into an allergy.   Bio compatible testing around 6 to 8 weeks is advisable so that allergens can be removed and the levels of antibodies reduced to limit the transfer over this critical time frame. Babies can appear to be born with allergy. If you have any history of allergy in the family, not just in the mother it is best to test and eliminate  as early as planing  conception. Re- testing around 6 to 8 weeks into the pregnancy is reccomended. The baby and mother should be tested soon after birth so that the mother (if breast feeding) can avoid the foods that baby is allergic to. This should eliminate the transfer of allergens through the mothers milk. Bio compatibility testing can also determine the correct formula for the child. We have available a separate baby kit for babies under 12 months old.