First of all, parents take their babies by train, but parents need to pay attention. There are many people on the train and the air is not very good. Moreover, the epidemic situation in our country has not been completely controlled, and both parents and babies need to wear masks. You can buy masks worn by children instead of big masks worn by adults.
Secondly, the baby is still a relatively young child, and there is no mobile phone to register the health code. Under normal circumstances, babies can register by train, and they don't need health codes, but adults do. Then there is no rule on how old a baby needs to be to take a bullet train. As long as the baby is healthy, parents can take the baby on the train. Parents need to prepare water, food and toys for their children to travel in strange environments to prevent them from crying. If the baby's physical condition is not very good, parents should never take the baby by train to avoid aggravating the condition.