Most newborns cycle through lighter and deeper sleep in roughly 45 minutes, so brief wake-ups between stretches are common.

Freshly pumped breast milk stays usable up to 4 hours at room temp, up to 4 days in the fridge, and 6–12 months in the freezer.

Most pills protect you right away if started in the first 5 days of your period; later starts need 2–7 days of back-up, based on pill type.

Pregnancy can happen right after a hormonal IUD is removed; many conceive in the next cycles, and most get pregnant within a year.

Mixed infant formula stays safest within 2 hours at room temperature, within 1 hour once a feeding starts, or 24 hours refrigerated.

Most babies get noticeably sharper vision between 4–6 months, with adult-like clarity closer to age 2.

Most newborns sleep in short stretches of 1–3 hours, waking mainly to eat, with longer blocks showing up bit by bit in the early months.

Postnatal depression can last for months, and with care many people start feeling steadier within weeks, then keep improving over time.

Most arm implants prevent pregnancy for up to 5 years, and protection drops once the labeled window ends.

Most newborns do well with 8–12 feeds in 24 hours, and a three-hour rhythm can fit when it matches your baby’s cues and steady weight gain.