What is the reason for the morning urine of the child starting to be a bit milky?

Patient's question:

Patient Gender: Male
Age:
Detailed Medical Condition and Purpose of Consultation: Recently, when the child urinates in the morning, the initial urine is slightly milky, but it becomes normal afterward. What could be the reason for this?
Current General Condition: No physical problems
Auxiliary Examinations: No tests have been conducted
History of Previous Diagnoses and Treatments, as well as Their Effects: Has not visited a hospital

Doctor's answer:

Hello, cloudy urine. If there are also bubbles, it could be proteinuria. Infants and young children are prone to acute glomerulonephritis caused by streptococcal infection, which can lead to proteinuria. It could also be chyluria, which is more common after parasitic infections. It is recommended to take the baby to the hospital for a urinalysis to determine if it is proteinuria, and then receive symptomatic treatment. Due to the inability to conduct a face-to-face consultation with the patient, the above advice is for reference only. Specific diagnosis and treatment should be carried out under the guidance of a doctor at the hospital.