My 3 month old still has a bruise and lump from her 2 month shots. is that normal? if not, what should i do?

Shots: It is possible and it even happened to my son, use some warm compresses and monitor it for signs and symptons of complications and if in doubt see his/her pediatrician

Lump from imm: There is a metal adjuvant ( a component of the vaccine that brings it all together) that can be left in the fat tissue on the way down to the muscle. This can leave a little lump in the leg. It usually resolves over a couple of months and nothing to worry about.

May be not: It might have gotten infected. Please see a doctor.

Hematoma: This is most likely a congealed blood clot under the skin where some minor bleeding occurred at the time of the injection. Warm applications help dissolve the clot which is harmless. Sometimes it has to be removed with a small incision if the lump is very firm and tender. Your pediatrician can advise you.