breast milk?

I was just wondering if it's okay my 8 month old main source of food is still breast milk? she eats food like puffs, mum mum's, and some baby food but she only eats a little and prefers nursing and sometimes goes a day or two without food just milk. I know their calorie intake increases as they get older so I just worry she may not be getting enough from just milk. she's a happy, active moving baby i guess I just want reassurance we are fine and she will eat in her own time. thanks mommas!