No harm at all. Colostrum is a super food - designed to be had in small amounts, so it may actually be doing him alot of good.

Colostrum has a laxative effect (though maybe in this way, not so much), so you may notice a change in his poos...but it is no harm.

I think you are doing a very lovely thing. Not weird at all.

xoxo happy birthing! XOXXO