my daughter slept through the night at 6 weeks because we put rice cereal in her bottle. cut the nipple a bit to allow it to flow better. the best thing is to let him cry it out. create a bedtime routine for him. give him a bath, brush his teeth/gums, read a story, and put him down in the crib. let him cry. it's not going to hurt him. he's capable of sleeping through the night, but won't because he knows you will go and get him up when he cries. put him to bed at around the same time every night. 7 is reasonable. my 22 month old goes to bed at 8, no later, no exceptions. every once in a blue moon, she will wake in the night and cry, but i don't go in there. i let her cry it out. fill his belly as much as you can before putting him to bed, so he doesn't wake up hungry wanting another bottle. rice cereal will help with that, and i hope that you have introduced solids by now. honestly, he can eat table food. we gave her jar food at 8 weeks, and by 5 months, she only ate table food, and took a bottle. i know it's hard to hear your baby cry, but there is nothing easy about being a mother, as you know. i would not use oatmeal in the bottle, you can use rice, wheat, barley, or anything else. oatmeal doesn't flow well.