Worried about talking for my 18 month old

Maria

Hi moms! So when do toddlers start talking? Like how many words should 18 months say? My son can say mama, dadda, hi, and bye! When I say things to him like close the door, clap hands, where’s eyes and nose he understands all of that! Should I be worried? I try to talk to him at home sometimes but I get tired with work so I don’t have time to read to him sometimes! I get sad and worried 🥺 thank you!