Was man short at the time of Adam (peace be upon him) then he gradually grew taller, or was it the other way round? May Allaah reward you with good.
Allaah created Adam (peace be upon him) sixty cubits tall,
then mankind gradually grew shorter until they stopped and remained as they
are now. The evidence for that in the Sunnah is the hadeeth of the Prophet
(peace and blessings of Allaah be upon him): “Allaah created Adam sixty
cubits tall, then mankind kept getting shorter until now.” (Narrated by
al-Bukhaari, 3326; Muslim, 2841). Ibn Abi Haatim narrated with a hasan
isnaad from Ubayy ibn Ka’b that the Prophet (peace and blessings of
Allaah be upon him) said: “Allaah created Adam a tall man with a lot of hair
on his head, as if he were a tall palm tree.”
Al-Haafiz ibn Hajar (may Allaah have mercy on him) said in
“ ‘Mankind kept getting shorter until now’ means that each
generation grew shorter than the generation before, and that decrease in
height ended with this ummah, and that is how they stayed.”
And Allaah knows best. May Allaah send blessings and peace
upon our Prophet Muhammad.