What could make a baby of 3weeks be crying to hard and loud?

Tips for soothing your baby

:Burp your baby after each feed.
Hold your baby.

*Cuddling helps some babies. Others quiet when held closely and swaddled in a lightweight blanket. To give your arms a break, try a baby sling or other type of baby carrier. Don’t worry about spoiling your baby by holding him or her too much.

* Keep your baby in motion.

* Gently rock your baby in your arms or in an infant swing. Check with manufacturer’s guidelines to be sure the swing is appropriate for your baby’s age.

* Lay your baby tummy down on your knees and then sway your knees slowl. Use a vibrating infant seat or vibrating crib.
Colic usually starts a few weeks after birth and often improves by age 3 months. By ages 4 to 5 months, the majority of babies with colic have improved.
Unfortunately, there are no proven treatments that consistently help every baby.