Caffeine

High levels of caffeine can result in babies having a low birthweight, which can increase the risk of health problems in later life. Too much caffeine can also cause miscarriage.

Source

Coffee

Do not have more than 200mg of caffeine a day.

Source
Careful

Guarana

Guarana is usually added to natural drinks and contains high levels of caffeine.
Source
Careful

Herbal Tea

There's little information on the safety of herbal and green teas in pregnancy, so it's best to drink them in moderation.

Green tea contains caffeine.

Source
Careful

Kola Nut

Kola nuts contain caffeine.

Safe

Yerba Mate

Yerba Mate tea contains a similar amount of caffeine as coffee.
Source
Careful