Hi. I can deeply understand as a parent what your concern is. Few kids do show delayed eruption. If you are able to notice a bulge it is a good sign. Most probably in months time you can expect the tooth to errupt.
Next Steps
I would advise you to get an OPG done so that we can get a fair idea of milk teeth positioning.
I would also like you to suggest if you give carrot strips cucumber strips long enough so they don't choke and give a massaging action to gums.
similar massage you can also do with your finger tip after washing your hands in circular motion .
Health Tips
kindly give any food bits in front of you so the the child is always under supervision to prevent choking .