Experience with growing spinach

Wr got four different spinach plants, even after two and half months they look small, the baby spinach is still like a baby (closer to the shade compared to others) ofcourse the others are growing now, not big but producing leaves, i started cutting them and using, they are very strong in flavor so didnt like it so much in my sandwitch.
Unitially the leaves had lots of holes so caterpillars or aphids might be eating, i got an eco friendly insect oil, i used only once and its all good now, may be i have to use more.