DS4 does not turn on

Hi
Today my controller was on the table when heard it vibrate and led red light flashing . I picked it up and it turned off and didnt start .
I tried reseting and charging but nothing happened ,no orange light nothing just when i press reset button a red light flashes and it is dead again .
Can someone explain it to me ?!!
Ps : my 8 month old daughter was playing with it before it . You know putting it into her mouth and ...