Query on children of Deborah MARKS

Deborah Benjamin - Lazarus 1834-1876 is on Geni with children born when she was very young (5 years old)

• 1839 Rachel Lazarus
• 1839 Benjamin Lazarus
• 1839 Moses Lazarus
• 1839 Bernard Lazarus
• 1839 Edward Solomon Lazarus

Quintuplets who all died in 1893

It seems very unlikely that a 5 year old would be the mother of quintuplets in 1839 that all survived and died in the same year.

She married David Lazarus 18 years later in 1857 in Australia and had the following children

• 1858 Julia Cortissos
• 1862 Eleazer Jacob Lazarus
• 1864 Caroline Hyman
• 1867 Edward Solomon Lazarus
• 1869 Lewis Henry Lazarus
• 1871 Isaac Isidore Lazarus

What is the source for these 5 children born 1839 died 1893?