Should I be worried?

Lesly

Hi everyone! So my LO is almost 7 months and is not sitting yet, he tries so hard and I’ve don’t everything to help him but he’s not there yet. Also he’s been with his gums swollen for the longest time and biting on everything and no teeth. Is this normal? Is he falling behind? Has this happened to any of you? I am a ftm so this is all too new to me.

Thanks