tooth coming in

Yesterday my sister in-law who watches my children everyday while I am at work. she found a new tooth of my daughters coming in from the bottom and the top. I know that they have new teeth coming in but I never thought that had so many. I am always wonder why they are always crying. I thought it was because they wanted to be held. They don’t have a fever or anything else. They are always good girls they never give mama a hard time during their teething period.