Why Hasn T My Toddler Gained Any Weight In Six Months, And Why Does She Vomit The First Food She Eats In The Morning?

Hi good evening /morning I have a daughter age 4,half years old, she weigh 15.kg the past six smooth i went with her to clinic she weighs 15kg , so which means she didn t gain a thing for the six months, which is shocking. She also has a habit of vomiting the 1st food she ate in the morning,