my indoor grow/ about a month old

these are my babies. they are about a month old now. About how old do they need to be in order for me to determine the sex. Also i just want to get some input from everyone. Also you guys dnt have to tell me about the yellowing of the tips. i already know the cause of it and i am working on it as we speak. Also btw the first two pictures are of my first plant and the last two are of my second one. Thanks everyone, input would be much appreciated.

Usually around a month you can start sexing, depends on strain. Those might have to get a little bigger first. What kind of light are you using?

Some won't show sex until flowering but the reverse can be true as well. I had pre-flowers in 2 weeks of veg.

Id say very small for a month but wat do i kno

well they are not quite a month. i was rounding up a lil bit because i forgot the exact day that i had planted them.