Whey protein powder is not recommended for young children, including toddlers, without the supervision of a pediatrician or a registered dietitian. The nutrient and calorie needs of growing children are best met through a varied and balanced diet, rather than through supplementation with protein powders.
It is important to consult with a healthcare professional before giving any supplement, including whey protein powder, to a child to ensure their growth and development needs are met in a safe and appropriate manner.