My kids have all been least interested in eating in the evening. They eat so much during the rest of the day that I am not worried though. Your bub is only 9 months old so don't stress too much - give him as much BM/formula (sorry you said BF and bottle so I wasn't sure what you are doing) as he wants. Babies when they teeth often slow down on eating solids and revert back to drinking milk so it might also be a teething issue. What you are experiencing is perfectly normal. If he was hungry, he would eat so it's okay if he isn't