C.H.
Well, I think that 4 months is a little too early to start with baby foods. I waited till almost 6 months ( 5 1/2 to be exact) and then I only feed my baby once a day (usually at nite before a bath). The formula or breast milk is the most important right now until he's about 6 months old. so maybe you can try again later!!!!! about waking up at nites, maybe 930 pm is too late for him to go to bed. I have been putting my son to bed at 7 pm since he was born and wakes up at 630 am. at 4 month the last bottle was at 10 pm and then right to bed again!!!! I read the baby whisperer book and it really helped me with putting him to sleep!!!! let me know if you need more help with this issue. Like I said I have been very successful to get him to eat well and sleep throughout the nite!!!!
C.