My daughter 3 n half month( dob 13/3/2018) has on off episodes of sudden sweating  and  watery palms and soles lasting for few mins , about 6 to 8 episodes per day. Palms and soles become very watery  otherwise she is active and normal. I observed this since 20 days. Her heart rate is 150/ min , rr 60/min during that episode, she has got neck holding n rolling over. Passes urine 12 to 15 times per day and stools 1 or 2 times per day. Her weight is 4.9 kgs, ht 61 cm , head circumference 41 cm . Her birthday weight was 2.5 kgs. Please suggest . Why is this happening. Is it anything serious. What investigation have to be done .My paediatrian told it's physiogical. Thank you.