My son is 2 months and a few weeks and  his pediatrician said I could start putting rice cereal in with his formula at night to help him sleep. Has anyone done this at 2 months ? Did it help them sleep longer ? My son was born 9 weeks early and he's about 7 1/2 pounds now at 2 months old and he wakes up every 2 hours to eat so I was hoping this might help him sleep longer through the night ..