Okay, 5 hari tanpa berak tu memang agak lama for a baby on mixed feeding, usually even BF babies boleh go a few days, tapi kalau dah 5 hari and anak nampak uncomfortable or tummy bloated, better check with your pediatrician sebab sometimes formula (even jarang2 pun) boleh cause constipation. Siapa tahu ada adjustment needed dengan formula type or feeding schedule dia, doctor dapat advise lebih clear based on anak's age and habits. Hang in there, mama!