I am the mother of a 2 month old baby , I do a lot of lifting the baby , rocking movements with the baby in my arms , it began as an uncomfortable pain in my left shoulder, now kind of gives me electric numbness kind if feeling at the area between my base of mech and both shoulders , a hot bath or hot water bag gives me temporary relief , but the pain or numbness returns back when I hold the baby etc .. I reckon this has happened after prolonged carrying / lifting baby in the same arm , please advice remedies.what could this condition be?