Eh common je ni, especially around 3-4 months! A few of my mum friends ada anak macam tu jugak, siang kurang minum tapi malam ok, so sebenarnya total intake dia masih ok, just distribution je yang berbeza. Bby mungkin distracted siang (sounds, lights, activity) or comfort nursing more at night, which is totally normal development, sebab tu some babies memang jadi "reverse cycle" sikit. Tapi kalau you worried pasal intake or weight gain, best check with your PD or LC to make sure everything's on track, especially for peace of mind first baby ni!