Generally, milk teeth erupt in 4~10 months, the baby seven and a half months has not yet teeth is normal, you can continue to observe, if 13 months after the eruption is not delayed.
Milk teeth are generally ossified at birth, hidden in the jawbone and covered by the gums. They usually begin to erupt 4 to 10 months after birth and can be complete by the age of 3 years. If the teeth have not erupted by 13 months, it is called delayed eruption of milk teeth, which may be caused by rickets, malnutrition and so on.
It is normal that no teeth have erupted at seven and a half months, so you can continue to observe and wait for the eruption of milk teeth. If the teeth have not erupted after 13 months, it may be caused by abnormal conditions.
Parents are advised to continue to observe the teething situation and consult a doctor if there is a delay in eruption.