Mostly speech/language milestones as well as some feeding/OT/PT milestones. Input the child's age in months and indicate whether the child has met each milestone. The Google Sheet formula will automatically indicate whether a milestone is delayed or not based on the child's age and developmental norm data (typical age ranges were obtained from "Assessment in Speech-Language Pathology: A Resource Manual, 5th ed." by Kenneth G. Shipley & Julie G. McAfee).