Yes , this could be an Allergic Reaction
to any of the Contents, which may include egg. Read the contents carefully. Watch particularly for swelling of the lips, eyelids, hands, feet,rapid breathing or breathing difficulty.They usually develop within a few minutes of ingestion of the Allergen( Offending food), but again the 2nd or subsequent episodes may be either more extensive or quicker to occur.Seek Medical help
of any of these signs. In the future,after consulting your Doctor & ensuring that Emergency help is at hand, try only one of the contents,i.e. separately, one at a time, keeping an anti-allergic Syrup , like Cetrizine
Be particularly careful if the child has earlier had , or you, your husband or your families have a history of Skin Allergy
( Atopic Eczema
), Nasal ("Dust")Allergy or Asthma.