Baby susu main2

Hi mommies. My baby is 4 months 9 days. These days dia banyak main2 bila nak bagi susu. I'm an epmom. So after pump, memang susu tu terus spare untuk next feeding hours. Normally, 3 hours gap per feeding. Tapi now, my baby buat dia punya feeding hours sendiri. Bila hulur botol susu, dia hisap main2 padahal that is supposed to be her feeding hours. Selalu tak habis lah kalau saya paksa dia minum susu. Perlu ke saya ikut my feeding hours atau follow baby punya feeding hours? Bagi susu bila dia nangis je. Help me please. Thank you.