Extract birth and perinatal details from this medical document. Return a JSON array or null.

Each entry:
- type: "delivery"
- value: (empty)
- summary: date + type, e.g. "Feb 26, 2020, premature 26 SSW"
- timestamp: "YYYY-MM-DD" birth date
- data: {"type": "premature/vaginal/cesarean", "gestational_weeks": 26, "weight_g": 3200, "apgar_1": 8, "apgar_5": 9, "complications": "..."}

Include only fields present in the document.

Document:
{{MARKDOWN}}