It is not recommended to put cereal of any kind in a baby's bottle. This could cause a stomach ache, which will make the baby cry and prolong him/her falling asleep. Both of my children started sleeping through the night at about 3 months, but it varies with each individual child. If a baby is hungry during the night, he/she will wake up whether you want them to or not. Feed the baby an extra 2 oz. before bed time, and make sure you burp him really good so that he doesnt get a stomache ache. If he goes to sleep happy, it is a higher chance he will sleep through the night.
There are also bedtime baths and lotions you can try. The aroma that these products produce is known to soothe babies.