Baby exposed to 2 languages

We live with my parents and little sister, we speak our mother tongue language at home (Pashto). It’s really important for us that our son learns his mother tongue first, and then English. My only concern is that my son will be slow in language development. I’ve found boys to usually be more delayed than girls in speech, and when they’re exposed to 2+ languages it sometimes also impedes their speech. Does anyone else live in a bilingual/multilingual home and how do you help your child learn both without confusing/impeding them?