It depends on which country you come from, as some EU countries are visa-free to the US while others are not.
Because unless you are from a country that is in the VWP, a visa is required to enter the country
list visa free countries to canada
countries that are visa free to kenyan citizens.
If you are from a country that requires a Visa, then yes a child of any age will need a Visa.
Yes
3 countries
Romanians hasn't free access in USA.
You don't.
countries that Ghana passport can enter without visa require.
Eliachim Molapi Sebatane is the Ambassador to the US for Lesotho.
Technically, you can return to your country after overstaying your visa then return to the US. However, you must not that if you have been illegally present in the US for a long time, you will be barred from returning to the US for 3 or 10 years.