Some cut at actual age. At 4 months I had 2 teeth 😅 so it’s very possible
My first son had 4 teeth at just over 4 months. My second son started teething at 2ish months. He teethed for a long time before getting 1 tooth at 6 months.
Babies can be born with teeth so they could be teething at any time. It can also take months of teething for the teeth to cut through. My baby started teething at about 2.5m adjusted, first tooth cut through about 3 months later.
My baby started teething around 4 months and her adjusted age was 2 months. It’s definitely possible, teething is a long process and you probably won’t see them cut through for at least another month. She’s now 6months and 2 weeks and they still haven’t broken through but are super close