Baby turns 6 months on the day he gg IFC - start solid

Hi mummies that have babies in IFC before 6 months. I am lost and confuse about starting solid altho my baby is only few months old but would like to know in advanced. My baby’s teacher told us to try give baby oats + hot water once he turn exactly 6 months to check for allergy as theyll be giving babies that for breakfast. However im curious. When starting solid, assuming baby only starts at 6 months(altho i know some start early), what if on the day he turns 6 months is the day he’s going schooling/IFC. How do i go about this?