My daughter is 5 months old and exclusively breastfed. This morning she regurgitated a bright yellow color. Do you know why?

It is possible that the yellowish regurgitation could be due to a mixture of stomach acids with breast milk, especially if it occurred after feeding. It is generally not a cause for concern if it happens only occasionally and if the baby is otherwise doing well. However, if it continues to happen or if you notice any other worrying symptoms, it would be best to consult a doctor for further evaluation and advice. Keep ensuring that your baby stays hydrated in the warm weather and monitor her overall condition closely.