Final answer:
Certain amino acids, specifically arginine, cysteine, histidine, and tyrosine, are only considered essential during childhood and must be obtained from the diet due to the increased needs for growth and development.
Step-by-step explanation:
Among the amino acids that are considered essential, certain ones are uniquely essential during childhood because they are necessary for proper growth and development. These are known as conditionally essential amino acids and they include arginine, cysteine, histidine, and tyrosine. While during adulthood, our bodies can produce these amino acids, in infants and children, they must be obtained from the diet.
It's important to note that the essential amino acids for all humans include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. Since the body cannot synthesize these amino acids, they must be supplied through food. For children, meeting these dietary requirements is critical for their rapid growth and development.