At birth, babies carry mom’s IgG antibodies for a few months and gain more protection from colostrum and early vaccines; full defenses build across year one.

Newborn gas is common; it’s too much if pain, poor feeding, poor weight gain, trouble breathing, blood in stool, or persistent vomiting shows up.

Newborn hiccups are common; call your pediatrician if they disrupt feeds or sleep, bring distress or vomiting, or persist past 3 months.

In the first weeks, most newborns take 1–2 oz (30–60 mL) per feed, rising to 2–3 oz by week 2–3, based on hunger cues.

Most newborns sleep 14–17 hours in 24 hours, usually in short stretches with frequent feeds rather than one long night.

Newborns average 14–17 hours a day; if sleep tops about 18 hours or feedings are missed often, call your pediatrician.

Most newborns drink 1–3 oz (30–90 ml) per feed, building toward about 2.5 oz per lb per day and usually not more than ~32 oz in 24 hours.

Give newborns 0.3 mL (20 mg) per dose after feeds or at bedtime; maximum 12 doses in 24 hours.

Newborn feeding is self-regulated; “too much” breast milk usually means frequent large spit-ups, discomfort, or bottles pushed past hunger cues.

For a 2-day-old newborn, offer about 1–2 ounces (30–60 mL) of infant formula every 2–3 hours, adjusting to hunger and fullness cues.