Separation anxiety
Babies and toddlers can become clingy and cry if you or their familiar carers leave them, even if only for a short time.
Separation anxiety, including fear of strangers, is common in young children between the ages of six months and three years. It's a normal part of your child's development and most will grow out of it in time.
You can find more information on separation anxiety, including why it happens, how to handle it and tips on how to reduce it an be found on the NHS website.