My DS is 2 and a half and on Saturday he suddenly started limping. Since then his leg as just given way underneath him and he has fallen to the floor. Then all of a sudden it's all OK again, then it repeats itself over and over again. He isn't complaining except when he falls. Took him to A&E they said it's looks as though it is just a sprain and to come back in a week if it is still happening. Do you think that is acceptable?