Q: My 13-week-old baby gets stiff, jumps, and has strong reflexes. Should I be worried about his soft spot?

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Question: My 13-week-old baby often gets stiff and seems like he wants to jump up when I hold him upright. He also stretches his legs out when I carry him in a sitting position. I've also noticed he has frequent hand and foot reflexes, whether he's awake or asleep. Additionally, the soft spot on the front of his head isn't always noticeable. Should I be worried about these things?

Answer: I understand you’re worried about your baby’s movements and the soft spot on his head. It can be alarming to see him stiffen or jump when you hold him upright, but at around 13 weeks old, many babies have strong startle reflexes that make them appear jumpy. If he stretches his legs out in a sitting position or shows hand and foot reflexes whether he’s awake or asleep, that can be quite normal at this stage of development.

I’ve often seen parents worry about the soft spot, known as the anterior fontanel, especially when it sometimes seems to disappear. The shape and size can change depending on your baby’s position, whether he’s crying, or how hydrated he is. This area typically closes on its own between 12 and 18 months, but if you ever notice it looking deeply sunken (which could indicate dehydration) or bulging persistently, it’s best to reach out to your pediatrician.

If you feel like your baby is unusually rigid all the time or seems in pain when he moves, trust your instincts and bring it up with a healthcare provider. It can also help to take short videos of any concerning movements, so your doctor has a clearer picture of what’s going on. Otherwise, as long as your baby is feeding well, sleeping normally, and staying alert, these movements and reflexes are likely part of normal infant development.

You’re doing a wonderful job being attentive to your baby’s needs. If anything continues to worry you or changes in a way that feels off, please contact your healthcare provider for personalized advice. I hope this information gives you some reassurance, but remember it doesn’t replace a proper medical evaluation.

For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.

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