Wilms tumour in one child does not usually mean the next baby will have the same problem, as it is often not strongly inherited, but a small risk can exist in some cases. There is no specific prevention during pregnancy, but regular antenatal checkups and routine scans help monitor the baby?s development. Try to maintain a healthy diet, proper rest, and avoid harmful exposures. If you are very concerned, consult your doctor about genetic counselling and follow up after birth for early screening if needed.