Watching the growth of my very small daughter was deeply emotional.
Remember how you learned that 感慨 means "strong feelings?" Well feelings so strong that you can not even think of a quantity to measure or explain how much you feel. These are really deep emotions. They fill you all the way up and you can't help but tell everyone about them.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.