I was in the park today , weather was warm so it was really busy. The children 4 and 8 were playing on the climbing frame and I was sat on a bench adjacent with a friend and a coffee watching them play. There was a little girl around 3/4 years old , she was in the park playing and I noticed she had run infront of the swings a couple of times. I quickly checked around for siblings/parents but couldn't see but as I was watching my own children I didn't take much more notice. A few minutes later I saw this little girl go flying through the air past where I was sat on the bench. She'd come down the small steep hill and landed funny, her neck had bent and her legs had flown back over her head. She was quiet then started screaming in pain. I looked around momentarily and didnt see anyone, then i instinctively and scooped her up and comforted her. I asked where her mummy or daddy was and she pointed to the other side of the park, i walked over searching carrying this poor child and couldn't find anyone. Then the said she was over there. Her mother was absolutely miles away on her phone head down. I had to leave the gate and walk across part of the field to meet this girls mum. She asked me what had happened and I said she's run down the hill and gone flying and she'd run infront of the swings a few times too. She didnt thank me for helping her child . And shouted at her little girl "what have you done now". I said it wasn't the little girls fault and she wasn't being supervised. And maybe if she had been watching her child then she wouldn't have gotten so hurt. It got a bit more animated and i ended up walking away .Am I being unreasonable to think parents need to stay off their phones and supervise their children in public.i see it a lot in soft plays. People so engrossed in their phones and not taking a slight bit of notice of their surroundings.