This is how an embryo looks like three days after egg fertilisation by sperm.
Its cleavage pattern is in the 8-cell stage, which means it is developing well optimally.
It is a good candidate for embryo transfer into the maternal uterus.
By Cristina Duque Royo MSc, PhD (senior clinical embryologist), Laura Garrido BSc, MSc (embryologist) and Sandra Fernández BA, MA (fertility counselor).
Last Update: 10/29/2018