Hello....my daughter is 4 months old. Recently, she adapted the habit of thumb and finger sucking. And now for every feed, she refuses to take the bottle. She is now formula-fed completely. For every feed she cries, refuses the milk and starts sucking her fingers. I tried to put mittens but she cries uncontrollably if she is not able to suck her fingers. Could you please help me know if this is a cause of concern? How to stop this?