OHHH feeling very reminisant here !!! This was me just over 11 years ago !!
16 1/2 months gap ...It will be a shock to you and ds1 at first....your ds 1 will seem soooo big compared to ds2 at nappy changing time!!
Can't really remember what preparation we did with ds1 apart from the usual stroaking my bump,giving baba kisses,..but also having time when baba was asleep in my tummy and will sometimes be asleep so lets have snuggles now and a book.
A couple of things that I did (because I am a lazy mother!) is I did not make ds1 be the "big boy now" he still liked his milk from bottles so when baba had boobie and then onto bottles he had a "bob bot" as well and we had a lovely quiet time watching Noddie (I know I should have been reading them a book but I said I was lazy !!!)
You will find your own way of coping with things that suit you and your family but it is do able I promise .......I went on to have another ds 22 months later ....went for a bigger gap that time !!!!!
DS1 was conly 3 and I still not make him to be the "big boy now"....lets just say bot bots and dummys stayed in our house foe quite a while !!!!
I now have 3 lovely sensible bright boys who apart from the normal squabble of who has got the biggest slice of cake get on really well....
Oh and I have still avoided giving my 11year old the"big boy now" label
Good luck and ENJOY !!!!
Ps ds2 AKA Baba did get a name but it was not used for about 3 years ds1 refused to accept it !!! No its baba !! not xxxx