Lots of info is available online snd there's absolutely no harm in calling for medical advice. Why guess?
Is food poisoning dangerous for toddlers?
"Yes, food poisoning is dangerous for toddlers (age 5 and under)
because their developing immune systems cannot fight bacteria as well as adults, and they dehydrate rapidly. While most recover quickly, severe cases can cause serious complications like hemolytic uremic syndrome (kidney failure)."
"Symptoms: Look for fever, nausea, belly pain, vomiting, and diarrhea."
What if my toddler ate old sushi?
"If your toddler ate old sushi,
watch for symptoms of food poisoning like vomiting, diarrhea, stomach cramps, or fever over the next 1–5 days. Because young children are at higher risk for dehydration and severe reactions, monitor them closely and contact a pediatrician if symptoms are severe or persistent."
- "Watch for Symptoms: Look for nausea, diarrhea, belly pain, fever, or excessive irritability (which can signal pain in young children).
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Watch for Red Flags: Call a doctor immediately if your child has a fever over 101∘F / 38.3∘C
vomiting for more than 12 hours, severe,
constant stomach pain, or signs of severe
dehydration (fewer wet diapers, no tears.
Lethargy
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Timeframe: Symptoms can appear 4 hours to 24 hours later, but sometimes take up to 3 days to develop
Excuse the wonky formatting.
Also, just phone you local medical advice line. Don't take chances with children, especially young ones.