Amazing! Diamond Platnumz's wife show off bare belly few days after the birth of her 5th child

How do these people even achieved this amazing feat self? Diamond Platnumz's wife, Zari gave birth to her 5th child  7 days ago. The proud mother who's the last child is her second with the Tanzanian star, wrote

Good morning.... ladies no need to worry coz our bodies are different. But I did exercise during pregnancy which has helped my body get bk within 7days.... and for those stretch marks keep using olive oil during and after pregnancy.

Another photo below: