Now the baby is full term like a normal baby. You can give a bath daily and direct  breast feeding. Monitor weight twice a week. Visit a pediatrician if weight does not increase

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 )

If the baby is taking direct breastfeeding adequate for about 15 mins and baby sleeps for 2 hours with passing urine and stools you can stop expressed breast milk and baby temperature is normal and you can give bath to your baby

It's normal

Greetings body temperature of 97.1°F (36.2°C) is slightly below the normal infant range of 97.7°F to 99.5°F, which may indicate your baby is too cold. You should dress them in an extra layer, use skin-to-skin contact, and recheck their temperature in 30 to 60 minutes. Supplements of expressed milk are often continued until a premature baby shows consistent weight gain and strong feeding stamina, a milestone your pediatrician must confirm. For bathing, it is generally recommended to wait until the baby’s temperature is stable and their umbilical cord stump has fallen off. Since premature infants are more sensitive to temperature drops, limit baths to two or three times a week using warm water in a draft-free room

To gain atleast 2.5kg