A.T.
The shots probably have made him feel a little ill and he may be sore at the injection site. Try a little baby Tylenol if it's o.k. with your Pedi to see if he is bothered by the shots. They always messed up my son for about a week or two depending on how many shots he got at once and the type. However - my son was still nursing every 90 minutes all night at 6 months so his "sleep pattern" wasn't affected. ;) Oy!