Diapers and eating

lol is 2 months and she barely had a wet diaper through out the night and when I left for work my husband was feeding her then she slept til mid morning and when she woke up he said her diaper was a little bit wet. And has only had 2 more wet diapers since. And she has only had 3 bottles. She eats every 2-3 hours and we fix 4 ounce bottles and she usually drinks them all but she was struggling with the last one my husband said but finally drank it. She isn’t gassy, she is happy, just somewhat fussy. Anyone have a clue or is this normal or should I call a dr.