My boy is 4 months plus , we started tummy time with him quite late. How often do u do tummy time with ur babies at this age, n how long is each duration?

I was not very hardworking with doing tummy time for my gal too. I started around 3 mo but I hardly did it because she had reflux then and she is very fussy when I flip her over. I was also very concerned at that time. I think the recommended no of times is two to three times a day for 3-5 mins. I was only doing it like once or twice a day. She did go on to flip around 5mo plus going 6, maybe a bit later than other babies but she still caught up with the other milestones after that. Try to do as much as you can but if you can't don't fret about it.