For me its not about time its about whether your relationship has been weather tested . Having a baby is hard in a myriad of different ways. Its wonderful and life changing but if ever there was a thing to truly test a relationship its that. Its a question of whether your relationship stayed solid through hard times. Whether you pull together as a team even when you are exhausted and hormonal.
To give my experience exdh and I had been married for 3 years and together for 5. However had been sunshine and roses so our relationship didn't have to withstand the winds battering. When the maelstrom of newborn time hit and the roller coaster between being ecstatic and exhausted and stressed hit the cracks started to show.
Some people are together 6 months and they have had to deal with hard times, or they have got lucky and the relationship was intrinsically solid. However having a newborn is not the time to find out the cracks in a relationship are canyons.
Unfortunately it doesn't matter how committed someone seems and what they say. It is only in the eye of the storm you truly find out who they are. Exdh after 5 years was not the person i thought he was. Its unutterably hard to realise this when dealing with a newborn , illness and exhaustion. It ended up (4 years later !) Killing the marriage
My DP though. Within a few months I had a stroke and I had to leisure out how to walk again , lost speech for a short time and he stepped up , instantly without complaint. In the middle of chaos he proved himself stalwart and reliable. Now we chose not to have any more DC to ensure my DC form my marriage were in a good place etc but I am absolutely sure if it had been the right thing for us to have Dc together he would have been solid and reliable because I saw our relationship tested and it thrived.
So its not about time , ita about whether your relationship has stayed happy and supportive when the winds are blowing