Was this article helpful?

We believe you should always know the source of the information you’re seeing.

Learn more about oureditorial and medical review policies.

baby being held up and stiffening arms

Boston Children’s Hospital.

Infantile spasms.https://www.childrenshospital.org/conditions-and-treatments/conditions/i/infantile-spasmsOpens a new window[Accessed February 2022]

CDC.

Concerned about your child’s development?

Article image

Hypertonia.https://www.childneurologyfoundation.org/disorder/hypertonia/Opens a new window[Accessed February 2022]

Cincinnati Children’s.

Encopresis.https://www.cincinnatichildrens.org/health/e/encopresisOpens a new window[Accessed February 2022]

Cleveland Clinic.

Hypertonia in babies.https://my.clevelandclinic.org/health/diseases/22231-hypertonia-babyOpens a new window[Accessed February 2022]

Mayo Clinic.

Article image

Colic.https://www.mayoclinic.org/diseases-conditions/colic/symptoms-causes/syc-20371074Opens a new window[Accessed February 2022]

National Institute of Neurological Disorders and Stroke.

Hypertonia information page.https://www.ninds.nih.gov/Disorders/All-Disorders/Hypertonia-Information-PageOpens a new window[Accessed February 2022]

Stanford Children’s Hospital.

Patterns of atypical muscle tone in the general infant population Prevalence and associations with perinatal risk and neurodevelopmental status.

Your child’s limbs seem stiff

Early Human Development.https://www.sciencedirect.com/science/article/pii/S0378378220307805Opens a new window[Accessed February 2022]

baby clenching fists

baby holding ear and looking at camera

A baby sitting on a kitchen floor and crying

phone with BabyCenter app

Stephanie Watson