Re-lactation at 7months

I breastfed my child for the first month but had some health things going on and decided to stop and formula feed. Now my baby is 7 months and I have a very strong want to be able to breastfeed my child. Would it be possible to start breastfeeding again? Would it be weird? My baby does currently have two teeth. I would also be willing to just pump. Any advice? Thoughts on re-lactation?