My husband is Miao, I am Han, and I have both baby accounts, but my eldest daughter is Han and my youngest daughter is Miao. I don't know if it has any influence.

It doesn't matter. The state has promulgated a new regulation. After the child reaches the age of 18, if a husband and wife like you are not of the same nationality within two years, you can apply for a change of nationality. If it is more than two years, they can't apply for changing their nationality! Then think about it! This is actually decided by the child himself!