My grandson was just born at 29 weeks, he has a 95% chance & is doing very well.
In the US, of 100 babies born at 25 weeks gestation, an average of 25 will die (black figures), and 75 will live to go home (blue figures).
Developmental outcomes for the 75 survivors at 11 years of age
Severe Disability (11%)
Moderate Disability (28%)
Mild Disability (44%)
No Disability (17%)
https://penut-trial.org/node/42
I’m very happy your grandson is doing well! Prayers up that he continues to do well and grow into a fine young man.