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Babies may appear to have floppy arms and legs, like they lack strength, with more noticeable weakness in their legs.3,4 They may have difficulty pushing up to their elbows and maintaining the position while lying on their tummy. They may also show slow, fatigued movements when trying to reach or grab toys. When held, babies may struggle to support themselves using their legs.4
Babies may struggle to sit still for extended periods and may lean forward or to one side. 2-4 Initially, this lean may be slight, but as they continue to sit, they may find it increasingly challenging and require further assistance to maintain the position.4
Babies may rock from side-to-side but struggle to roll fully onto their side or tummy when lying on their back. Over time, these movements may become even increasingly difficult for them.4
Look out for small tremors or shakes in the fingers or hands when your baby holds their arms out. 3 The shaking may be subtle and challenging to notice.
Babies may be slow to achieve developmental milestones such as sitting, standing, or walking without support. 2-4 Although they may reach these milestones, they may lose the ability to do so later.4