I've seen them at local boutiques... I'm sure they'd have them at those type of places. We made our Big Sister onesie for DD... no one makes Big Sister/Brother shirts in a 3 month size
If you can't find anything though, just get a plain shirt and either some fabric markers or paint or something along those lines and do one up yourself... it's easy and MUCH cheaper.
I just posted on the toddler board and I agree with the Children's Place. I got a Big Sister shirt there ($7.5 or 2 for 12) I bet that they have them on the boy side as well.
Re: Where to buy a Big Brother shirt
I've seen them at local boutiques... I'm sure they'd have them at those type of places. We made our Big Sister onesie for DD... no one makes Big Sister/Brother shirts in a 3 month size
If you can't find anything though, just get a plain shirt and either some fabric markers or paint or something along those lines and do one up yourself... it's easy and MUCH cheaper.
WalMart- it was $3!
DS 3.12.08
DD 7.11.09
DD 8.01.13
This is the one we bought too. They also have smaller ones that say "I'm the little sister" that I bought for the baby. Very cute.