What is the difference between "weak children" and "high-risk children" in children's health care?

These are two different concepts:1-"high-risk infants" refer to children who have factors that affect children's health during pregnancy and may affect children's health after birth, such as "high-risk pregnant women" whose mothers are newborns during pregnancy, "gestational diabetes", "premature infants" and "low birth weight infants". G-6- Parkinson's syndrome; 2-"frail children" refers to children who are affected by various factors after birth, such as anemia, rickets, pneumonia in children, malnutrition and so on.