I need to ask few more questions before answering your query. Early consultations can prevent complications. Kindly contact me on whatsapp chat  (84960595 six five) Dr Faisal Zoheb MBBS , MD PAEDIATRICS , PGPN (BOSTON), FELLOWSHIP IN NEONATOLOGY ( Newborn and vaccination specialist )

At 10 weeks, a 5 kg baby needs approximately 150 ml/kg/day, which comes to around 750 ml/day total. 250 ml/day is significantly less than required.

500 to 600 ml is ideal.but if u can not measure see the wt gain,activeness of child,and6to 7 time a day passage of urine suggest that intake of the infant is ok

Greetings An intake of 250 ml is likely insufficient for a 10-week-old baby weighing 5 kg. Typically, infants this age require approximately 150 ml to 200 ml of milk per kilogram of body weight every 24 hours. For a 5 kg baby, this totals roughly 750 ml to 1000 ml daily, divided across multiple feedings. Since you are combination feeding, you must double-check the formula label and track daily wet diapers to monitor hydration

Depends on the weight gain. You have to check weight gain at least once in week to check. If the daily weight gain is 20-30 gms during first 3 months it is a good weight gain and the baby is growing adequately because of the feeding. Roughly the baby weight should double in 3 months. Triples by one year.

Watch for weight gain

Not at all sufficient very less

At this age daily intake should be 700 to 900 ml milk approx ml. If your baby is taking only 250 ml total in 24 hours, that is likely less than required. However, if breastfeeding is also happening directly, it is difficult to measure the exact intake.