I just went to my Nursery on Tavros after giving birth to Amber's kids, so I could check on everyone there. While there, I noticed that the tentacle I gave birth to is showing as 6-9 months old, and my two Raskvel offspring are listed as 1-4 years and 9-12 months, respectively. I'm only on day 119 of the game, which should be around 4 months if the months in TiTS are around 30 days each, as in real life.