For a one-year-old child, peaches and kiwis are the best, followed by apples and oranges. Pears and oranges should be avoided, the former is easy to have diarrhea and the latter is easy to cough.

2 Mix the fruit juice with warm water (not higher than 70 degrees). In my opinion, one-year-old children should be 3: 1, and orange juice should be 4: 1. You can't use heated kitchen utensils to heat it, or all the nutrients will be gone. It is best to wash the fruit now, then add warm water to stir, and then scald it with hot water through the cup, but the time should not be too long. Try the temperature with your mouth, which is better than the temperature of your lips.

3 Kiwifruit is rich in vitamins, which is good for children's growth and development and can enhance their physical fitness; Apples can nourish the stomach and avoid indigestion and diarrhea; Oranges help digestion and have bactericidal effect on common viruses. These three kinds are enough. Try to use it half an hour after meals. First of all, you should use them moderately. After all, fruit juice is not a substitute for staple food, but an aid.

I hope my answer can give you some hints.