Question

this is a condition of predictable periods of significant distress in an otherwise well - fed, healthy baby.
colic
purple cry
diabetes
sids

Explanation:

Colic is characterized by predictable periods of significant distress in an otherwise well - fed and healthy baby. PURPLE cry is a mnemonic for understanding infant crying patterns but not the specific term for this condition. Diabetes is a metabolic disorder not related to this baby distress description. SIDs (Sudden Infant Death Syndrome) is about unexpected death of infants, not distress periods.

Answer:

colic