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Any concerns about muscle weakness in infants should be evaluated by a healthcare provider right away. In SMA, muscle weakness typically
- Affects both sides of the body equally
- Often starts in the lower body
- Impacts muscles closest to the shoulders and hips
- Can affect developmental milestones Motor skill development Show Full Answer

Any concerns about muscle weakness in infants should be evaluated by a healthcare provider right away. In SMA, muscle weakness typically:
- Affects both sides of the body equally
- Often starts in the lower body
- Impacts muscles closest to the shoulders and hips
- Can affect developmental milestones Motor skill development varies depending on the type of SMA. Since your grandson is already crawling, this is a positive sign of motor development. However, if you notice any changes in his ability to:
- Move his arms equally
- Support his head
- Meet developmental milestones
- Maintain muscle strength

It's important to discuss these observations with his pediatrician who can properly evaluate his condition.

 AI-generated responses are not a substitute for medical advice. These services are not intended to diagnose, treat, or cure any condition or disease. Always ask your doctor about specific health concerns.

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