It is generally safe to give Lax-A-Day to a child of 23 months old for constipation, but it is important to follow the dosage instructions provided on the packaging. If your child is experiencing significant abdominal pain, fever, nausea, or vomiting, it is important to consult a pediatrician. For hemorrhoids, it is recommended to seek advice from a medical professional, especially for young children, to avoid any potential complications. In the meantime, you can consider using Tylenol for pain relief and ensuring proper hygiene in the affected area.