The first week with a newborn is a blur of feeds, diapers, and questions you did not know you had. Is that much sleep normal? Why is the diaper black? Why did the baby lose weight? If you are asking what you should know about your baby’s first week, the most useful answer is a short list of numbers and patterns: what feeding, diapers, weight, and sleep should look like, and which signs mean call a clinician now.
I am not a pediatrician, and this is general information, not medical advice. Your baby’s own provider sets the plan, especially for babies born early, small, or with a health condition.
Most first-week worries come from not knowing what normal looks like. A baby who loses a little weight, sleeps most of the day, and passes tarry stools is often doing exactly what newborns do.
This guide covers a quick answer, a day-by-day diaper table, weight and feeding facts, sleep and jaundice basics, warning signs, mistakes to avoid, and a short FAQ.
What should you know about your baby’s first week?
In the first week, expect frequent feeding (8 to 12 times a day for breastfed babies), a small early weight loss of up to about 7 to 10 percent, rising wet diapers, changing stool color, and long sleep in short stretches. A pediatric visit usually happens within 3 to 5 days. Call urgently for fever, poor feeding, or trouble breathing.
What do diapers tell you?
Sources differ slightly on exact counts, so use these as guides.
| Day | Wet diapers | Stools |
|---|---|---|
| 1 | About 1 | Dark, tarry |
| 2 | About 2 | Changing |
| 3 | About 3, rising by 1 each day | Greenish-yellow |
| 4 to 5 | At least 6 by days 4 to 5, with 3 yellow seedy stools | Yellow, seedy |
| By day 6 | About 6 each day, with pale yellow urine | 3 to 4 stools, each at least a teaspoon |
Stools start out tarry black, then become seedy yellow, green, or brown.
What about weight and feeding?
| Topic | Guidance |
|---|---|
| Early weight loss | A baby may normally lose up to 7 to 10 percent of birth weight in the first 3 to 4 days |
| Regaining weight | Usually by 10 to 14 days of age |
| C-section note | Babies may lose more and take longer to regain |
| Concern level | Pediatricians become concerned when weight loss reaches 10 percent or more |
| Breastfed feeds | About 8 to 12 times in 24 hours, every 2 to 3 hours |
| Waking for feeds | Wake newborns to nurse at least every 3 hours until they regain birth weight |
| Formula-fed feeds | About 6 to 8 times per 24 hours, roughly every 3 to 4 hours |
| Night gaps | No longer than one 4 to 5 hour stretch |
What are sleep and jaundice like?
| Topic | What to expect |
|---|---|
| Sleep | 16 to 17 hours a day in stretches of 2 to 4 hours |
| Day and night | Newborns do not tell them apart for weeks |
| Jaundice | Common, affecting about 60 percent of full-term babies |
| Timing | Usually appears between days 2 and 5 |
| Urgent signs | Jaundice in the first 24 hours, lethargy, poor feeding, or yellowing that spreads to the legs or palms |
| Pediatric visit | Between days 3 and 5 to check weight, feeding, and hydration |
Always place your baby on their back to sleep, in a bare crib or bassinet.
When should you call right away?
| Sign | Why |
|---|---|
| Fever | 100.4°F (38°C) or higher rectally or on the forehead |
| Poor feeding | Or fewer than 4 wet diapers in 24 hours after day 4 |
| Hard to wake | Lethargy or difficulty waking for feeds |
| Breathing | Fast or labored breathing, grunting, or flared nostrils |
| Dehydration | No urine for 8 hours, sunken eyes, or a dry mouth |
Ask your pediatrician how to take your baby’s temperature, and call for any fever in the first weeks.
What mistakes should you avoid?
- Skipping the first visit. It checks weight, feeding, and jaundice.
- Letting a sleepy baby skip feeds. Wake them.
- Ignoring diapers. They are your best feeding gauge.
- Waiting on a fever. Call right away.
Frequently asked questions
Is it normal for a newborn to lose weight?
Yes, a small loss is normal, and most babies regain by about two weeks.
How much should a newborn sleep?
Often 16 to 17 hours, in short stretches.
When should you see a pediatrician?
Usually within 3 to 5 days of discharge.
Bottom line
Track feeds and diapers, expect early weight loss, keep sleep safe, and attend the first visit. Call right away for fever, poor feeding, jaundice that worsens, or breathing trouble.
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