My Baby is very picky about eating. He is 6 months old and I havent found a fórmula he enjoys drinking we have tried many different formulas: Similac Neosure, Enfamil Gentleease, Gerber Goodstart, Similac Sensitive, Alimentum, Nutrimigen and Earths Best Soy Formula thinking he was sensitive to milk but nothing has worked. He will drink it ok for a couple of days or even a week a then just starts spitting it out. He was born underweight and being a picky eater has made gaining weight more challenging. I was given Nido as a child when I lived in México will it be ok to try that on my 6 month old aby? Or is there another formula you think he might like and motivate him to eat more?