what age do second teeth appear?

[Mercedes]

My DD's first tooth felt out last week. She's only 4.2. I can see her second tooth growing through already.
Is this something I should be worried about? I though there was gaps between the old tooth and the new tooth growing in? and I know she's young for her tooth to fall out.
She did her her first tooth very early - 16 weeks. My mum says my baby teeth came in very early but my second teeth were in line with everyone else's. My DP has started worrying that cos she so little there won't be enough room in her mouth for her teeth to grow.

4 is young isn't it. My dd is 6 and her 4th tooth fell out today. Her top, two, front teeth are missing at the moment and she keeps giving me a lovely, toothless grin.

If it's happening there's nothing you can do about it so stop worrying.

Be more worried if she never loses her baby teeth just in case the new ones are growing underneath. My DD age just 7 has both her new teeth at the front at the top and the ones at the bottom and the the either side top and bottom have both come out. Most of her friends have lost just one or two.