Hi ... My second baby has completed 5 months yesterday but today morning I saw swelling in his left thigh. Thrre is no insect bite or neither he falls. I visit a paediatric he says there may be some infection inside and might be pus inside it. He gave antibiotic and told me to visit him on sunday. But my baby is still very active and laughing . Even when doctor press the swollen area he didn't cry. I am still worried . What is the reason behind that