Cow milk is not an issue if accepted and digested well, but needs to be given undiluted. It would be better to increase volume and frequency of your complimentary feeds (other than milk) than giving too much of cows milk.
Try to prefer breastfeeding as much as possible instead of cows milk.
Next Steps
Reduce stress levels to increase breast milk production, increase complimentary feeds per day, may be given cow milk , but undiluted ** if well tolerated
Health Tips
Consult for any further queries