My now 5 year old son had bowel struggles for 3 years that I told Dr. Singh about (from 18 months to 4 and a half). Dr. Singh said it's all normal and age appropriate.  I happened to get a nurse practitioner once and after chatting with her for 5 minutes she diagnosed our son with constipation and made a treatment plan that had things working normally after just 2 weeks. Yet Dr. Singh couldn't figure it out after 3 years.