 [ Symptoms ] should i give my 3 year old omega 3 supplement on top of her pediatrician prescribed vitamin [ Disease ] your description is really not sufficient for me to even make a wild guess i do not know your baby is age or the location of these lumps and obviously i have no way of feelingexamining them to give you a definitive answer any chance that they are related to the vaccine administrations on the upper thigh area children often bleed a tiny bit under the skin from the injection this area can form a tiny innocent lump that can take a while to self resolve