A "miracle" baby from Spain was delivered still inside the fully intact amniotic sac in an amazing and unusual birth. The rare birth, known as a 'caul birth', only happens every 80,000 pregnancies. The mother was shocked to see her baby still inside the sac bubble, just minutes after the baby's twin was delivered normally

YOUTUBE These births only happen for every 80,000 pregnancies

The amniotic sac usually breaks because of the stress during childbirth. When the amniotic sac breaks, the fluid held inside is what is usually described as a woman's 'water breaking'. The video, filmed in Spain on Saturday, captured the baby moving inside the clear sac on a hospital table as doctors and nurses watched on. The baby's hair and its blue umbilical cord can be clearly distinguished in the video. Footage of the baby moving around inside its sac has already been viewed nearly seven million times.

The amazing video shows the newborn lying inside a clear sac which is tightly stretched around its body. In the clip, medical staff gently prod at the transparent membrane and point out the baby's tiny feet as it pushes against the sac.

YOUTUBE Normally, the amniotic sac is broken during the strenuous process of childbirth

The video has already been viewed more than 6.8 million times