Cereal to sleep longer

m231

DS is 2 months.  Dr. asked me how long he's been sleeping at night (anywhere from 1 to 4 hours at atime) so I told her.  She then mentioned giving him a little rice cereal at night. 

Is this normal advice?  Anyone do it?

I've tried it the last three nights.  2/3 nights he's slept more than 5 1/2 hours.  I'll take it!!!

However, I don't want him to be obese or get allergies!  What would you do?  Thanks in advance!