Doctors say a baby boy was infected with Covid-19 inside the womb after the mother passed the virus to the baby and they called this  utero transmission. 
Fortunately, the mom and infant are actually doing well, despite the fact that the mom and the baby was fairlysick before their recovery.
As reported by Nature Communications, medical doctors at Antoine Béclère Hospital inside the suburbs of Paris, the 23-year-old mother was admitted to the clinic in March 2020 while she’s in her late third trimester. After showing symptoms such as a sky high fever and a whooping cough, she tested positive for SARS-CoV-2, the virus liable for Covid-19. 

Just a few days after being admitted to the hospital, doctors observed that her baby  showed signs of distress so decided to carry out an emergency cesarean section. The infant was born and immediately moved to neonatal intensive care unit. 

Tests on the infant’s blood and fluid extracted from the lungs revealed he also had a Covid-19 infection. While he appeared healthy for his three days of life, the baby began become reckless and had trouble feeding, which the report says that it shows consistent  signs and symptoms of Covid-19. The baby was able to recover without the need for any medicines and his follow-up scans showed the all-clear. 
According to studies, this is the first case of a baby being infected with Covid-19 in utero via transplacental transmission. Italian researchers have also presented two instances that appear to reveal Covid-19 transmission from mom to baby during pregnancy, although their studies have to be reviewed. Doctors have previously reported the same instances of newborn babies testing positive for Covid-19 though  it didn’t appear the new coronavirus was transmitted in the womb through the placenta. 

“This is a very detailed and well-characterized case report showing very likely transplacental transmission of the SARS-CoV-2 virus,” as told by Professor Christoph Lees, Professor of Obstetrics at Imperial College London, who was not involved in the study.
But some other medical experts are not totally convinced by this.

“This case study does not provide strong evidence for transmission of SARS-CoV-2 via the placenta,” as insisted by Professor Alexander Heazell, professor of obstetrics and director of the Tommy’s Maternal and Fetal Health Research Centre at the University of Manchester. 

“The report just shows the presence of the virus within the outer layer of the placenta (the syncytiotrophoblast), there is no proof that the virus is in the next layer of cells (the stromal cells). Therefore, there is evidence that the placenta itself may be infected, but still no evidence that the virus has successfully passed through it to infect the fetus.” 
Among the numbers of babies born with mothers with SARS-CoV-2 virus, only a few were tested postivie- this is areoung 1-2 % only. As in this report, most babies do not appear to become severely unwell,” said Professor Marian Knight, Professor of Maternal and Child Population Health at the University of Oxford.