One day his mom made him feel the baby's movements by placing his palm on her stomach. The kid appeared serious and didn't say anything.
From that day onwards he stopped telling his teacher about his baby sister. Out of curiosity one day his teacher checked about his baby sister, the boy's eyes were filled with tears. He replied. My Mummy ate it!
What you want to convey and what gets conveyed may be very different – be sensitive. Innocent turn of events….