UK Mummies...Tax Credits

Just • 2 girls & baby girl no3 on her way 😘
Just wondering what you get with tax credits for two children? 
I have one child at the moment who is almost 4 so get the standard £61.59. What do you get for the next child? 
Also child benefit what do you receive for second child with that? For my daughter I get £20.??
I am not being a money grabber I am simply curious to what I will get when this baby is born.