**Yes—10–12 hours at night can be okay for a healthy 4-month-old.** It isn’t automatically abnormal or harmful. The key is whether your baby gets enough milk overall and is growing well; healthy, growing babies generally don’t need to be awakened for feeds. [American Academy of Pediatrics](https://www.healthychildren.org/English/ages-stages/baby/sleep/Pages/Sleeping-Through-the-Night.aspx)

Reassuring signs include steady weight gain, good daytime feeding, normal wet diapers, and being alert and responsive when awake. The recommended sleep amount at 4–12 months is **12–16 hours over 24 hours, including naps**—a guide rather than a strict limit. [American Academy of Sleep Medicine](https://aasm.org/recharge-with-sleep-pediatric-sleep-recommendations-promoting-optimal-health/)

The main potential downside is missing needed feeds. If your baby was premature, has poor weight gain or a medical condition, or has been prescribed overnight feeds, check with their pediatrician before allowing such long stretches. Otherwise, mention the pattern at the next routine visit so they can confirm that growth and feeding are on track. [Mayo Clinic](https://www.mayoclinic.org/healthy-lifestyle/infant-and-toddler-health/expert-answers/newborn/faq-20057752)

Seek medical advice promptly if sleepiness increases suddenly alongside poor feeding or fewer wet diapers. **Difficulty waking, limpness, or breathing trouble warrants emergency care.** [NHS](https://www.nhs.uk/baby/health/when-to-get-urgent-medical-help-for-babies-and-children-under-5/)

Continue safe sleep: place baby on their back on a firm, flat, empty sleep surface, in their own crib or bassinet in your room for at least the first six months. [NIH](https://safetosleep.nichd.nih.gov/reduce-risk/reduce)