Hi I was just wondering if anyone has started ...

Hi I was just wondering if anyone has started to feed their baby prior to 4 months. My 3 month old daughter is showing alot of interest in the foods my husband and i are eating. She will also stop drinking her milk and scream along with sucking her fists if we eat in front of her. If i offer her the milk again she just refuses. She is gaining weight really well on her formula but is also drinking heaps - approx 180ml a feed and still not sleeping for more than 1 hour after her day feeds. Any opinions would be appreciated.