Teething

So my baby was born early at 30 weeks, July 10th her original due date was September 17th.. she was in NiCU for two months. She’s now 4 months but technically 2 months.. it appears that she’s already teething… is that normal for her to be teething so soon? If she was really considered 4 months I wouldn’t think too much of it but because I go by her adjusted age I’m a little confused! Could it be she’s reaching milestones on time??