At the Midland Met University Hospital, 938 babies were born during June and July's heatwave period.

Pregnancy makes it harder for women to regulate their body temperature, and even a single day of extreme heat can put extra strain on mother and baby.

Research has linked heatwaves to an increased risk of premature birth and other pregnancy complications.

Newborn babies are also particularly vulnerable, as they cannot regulate their body temperature effectively and can overheat quickly.

Parents and carers are encouraged to look out for warning signs including unusual sleepiness, poor feeding, fewer wet nappies than usual, rapid breathing and feeling unusually hot.

For babies under six months old, breast milk remains the safest and most effective way to keep them hydrated during hot weather.

Katie Philpott , head of Midwifery at Sandwell and West Birmingham NHS Trust, said: "Extreme heat is not just uncomfortable, it can pose a serious risk to pregnant women, new mothers and newborn babies. During pregnancy, the body is already working harder and coping with higher temperatures can become much more difficult, particularly during a heatwave.

“We know that hot weather can increase the risk of complications in pregnancy, including premature birth, so it is important that pregnant women take heat warnings seriously and take steps to keep cool and well hydrated.

“Newborn babies are especially vulnerable because they cannot regulate their temperature in the same way as older children and adults. Parents should keep a close eye on their baby, particularly during the hottest parts of the day, and seek advice if they are concerned about symptoms such as poor feeding, unusual sleepiness or fewer wet nappies.

"The good news is that most heat-related illness can be prevented. By staying hydrated, keeping out of the sun during the hottest hours and knowing when to seek help, families can help protect both mother and baby throughout periods of extreme heat."