Extinction of sucking reflex in a child

Hello. The child is now 11 days old, we are in the hospital with ischemia after the hospital. There was a weakening at the end of labor, and then a cesarean section, in which a double tight neck entanglement was revealed, which spoiled CTG in the last period. At first, he lay for 3 days in intensive care, there he was fed intravenously, because There was an unstable saturation. Now she was normal, transferred to another department, fed with a mixture, but with a gradual increase in dose, it turned out that she couldn’t eat so much - “falls asleep” quickly. Pediatrician puts fading sucking reflex. A neurologist came earlier when this problem was not noticeable, said that there were no complaints. Is there any way to fix this?