As time passes, you may notice that your child's growth isn't completely on the straight and narrow. Many young kids have flatfeet, toe walking, pigeon toes, bowlegs, and knock-knees. As kids grow, some of these conditions correct themselves without treatment. Others don't or become more severe because of other medical conditions. But many orthopedic (bone) conditions, just like dimples or cleft chins, are just normal variations of human anatomy that don't need to be treated. Flatfeet Most babies are born with flatfeet and develop arches as they grow. But in some kids the arch never fully develops. Parents often first notice this because their child has what they describe as "weak ankles" (which appear to turn inward because of the way the feet are planted). Flatfeet usually don't cause problems. Doctors only consider treatment if it becomes painful. They also don't recommend any special footwear, such as high-top shoes, because these don't affect the development of the arch. Parents sometimes worry that flatfeet will make their kids clumsier than other kids, but doctors say that being flatfooted isn't a cause for concern and shouldn't interfere with playing sports. Sometimes, doctors will recommend inserting arch supports into shoes to reduce foot pain. Toe Walking Toe walking is common among toddlers as they learn to walk, especially during the second year of life. The tendency often goes away by age 3, although it lasts in some kids. Occasional toe walking should not be cause for concern, but kids who walk on their toes almost all the time and continue to do so after age 3 should see a doctor. Persistent toe walking in older kids or toe walking only on one leg might be linked to other conditions, such as cerebral palsy, muscle weakness disorders, autism, or other nervous system problems. If an otherwise healthy child has persistent toe walking, the doctor might recommend a few visits with a physical therapists to learn stretching exercises. Once a child is around age 4 or 5, casting the foot and ankle for about 6 weeks may be needed to help stretch the calf muscles. In-Toeing (Pigeon Toes) Babies may have a natural turning in of the legs at about 8 to 15 months of age, when they begin standing. As they get older, parents may notice their children walking with feet turn inward, also called in-toeing, or walking pigeon-toed. Intoeing can have a few different causes that are normal variations in the way the legs and feet line up. Children who intoe and trip often may have internal tibial torsion, in which the lower part of the leg is rotated inward. Children over the age of 3 or 4 with intoeing may have femoral anteversion, in which there is a greater-than-normal bend in the upper part of the leg, which causes the upper leg to rotate inward. In some children, intoeing can be related to existing medical problems such as cerebral palsy. Doctors rarely have to treat pigeon-toed feet. Special shoes and braces commonly used in the past were never proved to speed up the natural slow improvement of this condition. In-toeing usually doesn't interfere with walking, running, or sports, and ends on its own as kids grow into teens and develop better muscle control and coordination. Bowlegs Bowleggedness (also called genu varum) is an exaggerated bending outward of the legs from the knees down that can be inherited. It's common in infants and, in many cases, corrects itself as a child grows. Bowleggedness beyond the age of 2 or bowleggedness that only affects one leg can be the sign of a larger problem, such as rickets or Blount disease: Rickets, a bone growth problem usually caused by lack of vitamin D or calcium in the body, causes severe bowing of the legs and also can cause muscle pain and enlargement of the spleen and liver. Rickets is much less common today than in the past. Rickets and the resulting bowlegs are almost always corrected by adding vitamin D and calcium to the diet. Some types of rickets, however, are due to a genetic condition and may need more specialized treatment by an endocrinologist. Blount disease is a condition that affects the tibia bone in the lower leg. Leg bowing from Blount disease is seen when a child is about 2 years old, and can appear suddenly and quickly become worse. The cause of Blount disease is unknown, but it causes abnormal growth at the top of the tibia bone by the knee joint. To correct it, kids may need bracing or surgery when they're between 3 and 4 years old. You should also take your child to the doctor if bowleggedness is only on one side or gets progressively worse. Knock-Knees Most kids show a moderate tendency toward knock-knees (also called genu valgum) between the ages of 3 and 6, as the body goes through a natural alignment shift. Treatment is almost never needed because the legs usually straighten on their own. Severe knock-knees or knock-knees that are more pronounced on one side sometimes do need treatment. Devices like braces, splints, and shoe inserts aren't helpful and are no longer used. In rare cases where children have symptoms such as pain or difficulty running, surgery might be considered after age 10. Back to Articles Related Articles Activity: Bones Do you know bones? Label these parts of the skeletal system. Read More Blount Disease Blount disease is a growth disorder that causes the bones of the lower leg to bow outward. This gets worse if it's not treated, so early diagnosis is very important. Read More Blount Disease Blount disease is a growth disorder that affects the bones of the lower leg. It causes bowing of the leg below the knee, which gets worse if it's not treated. Read More Getting an X-ray (Video) You'll get an X-ray if your doctor thinks you might have a broken bone. Find out how X-rays are done in this video for kids. Read More A to Z: Genu Varum Learn about common childhood orthopedic conditions and conditions that affect the legs and knees. Read More A to Z: Genu Valgum Learn about common childhood orthopedic conditions and conditions that affect the legs and knees. Read More Broken Bones What happens when you break a bone? Read More In-toeing & Out-toeing in Toddlers What is in-toeing and how will it affect your child? Find out what the experts have to say. Read More Bones, Muscles, and Joints Without bones, muscles, and joints, we couldn't stand, walk, run, or even sit. The musculoskeletal system supports our bodies, protects our organs from injury, and enables movement. Read More Casts Some injuries will heal best if a cast is used. Find out how they work and how to take care of them in this article for kids. Read More Bones, Muscles, and Joints Our bones, muscles, and joints form our musculoskeletal system and enable us to do everyday physical activities. Read More Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.