I haven't used the Happiest Baby on the Block method, but have another suggestion: The book "How to Talk so Kids will Listen and Listen so Kids will Talk" (they also have a teen version)suggests validating your child's feelings. For example (this just happened 10 minutes ago with my 4-year-old) my son wanted to play PlayDoh but his friend (a 2-yr.-old) was visiting and I didn't want them to make a mess, so I told my son he couldn't play with it now, maybe later. My son threw himself on the floor and I patted his back and said "It's okay." At this point, he bit my foot! So, I told him, "It's okay to be mad and frustrated because you want to play with the Playdoh and I said not right now. It is NOT okay to bite me, so give yourself a time out and come back when you are ready." He walked to another room and sat until I called him (3 minutes later).
I've been teaching him since he was very young that feelings are okay. You know how some parents say "Don't be mad." Well, I tell my son that it's okay to be mad and then offer suggestions, give boundaries, etc. as to how "mad" manifests itself. So, it's okay to be mad, not okay to hit or throw. When he would cry, I would tell him to "breath in and breath out" and count to ten. And I would do it with him. So, now the tantrums are brief and he calms himself down fairly quickly. Plus, he can tell me how he feels- if he's mad or frustrated or tired.
This whole idea of validating feelings is important. We don't want our kids to grow up and second-guess their feelings, and we do want them to be responsible and choose good actions. It's like when I argue with my husband, sometimes I just want him to say to me "Honey, I hear you and I get how you feel." When he does this, I find myself calming down because I just wanted to be understood. Same thing with our kids.
Your 18-month-old is testing his boundaries and you can give him support and the vocabulary with which to express himself now and later in life. Good luck!
Take Care,
F.
www.discoverytoyslink.com/fatimac
(We have a Rhyming Picture Storybook called THE WAY I FEEL on sale for only $9.99)