Q.When will a Guava sapling sprout out branches
I planted a Guava sapling five months back. It has now grown about 4 feet tall and is healthy. What I need to know is when will it start to sprout out branches? (It is only growing straight upwards) Someone told me that I should cut the top off the plant and then it will start to grow branches. Please kindly advise.

oops, If you want a taller plant, don't take the growing tip now. If you prefer a shrubby plant to a tree, remove the growing tip now. The ultimate size and habit will depend on the variety.

These articles should help: https://www.gardeningknowhow.com/edible/fruits/guava/growing-guava-fruit-trees.htm
https://aggie-horticulture.tamu.edu/citrus/guava.htm
http://forums.gardenweb.com/forums/load/tropical/msg0912364130164.html