Hmm, boleh jadi dia dah kenyang sikit during the day so malam kurang interested, atau memang some babies like that lah, tapi since he's only taking 1oz when he does feed, I'd check with your pediatrician just to make sure he's gaining weight okay and getting enough overall dalam 24 jam, sebab yang penting is total intake, bukan timing. Kalau daytime feeds dia okay, mungkin tu je style dia, but better safe than sorry dengan berat badan dia.