Baby - A baby generally represents you feelings such as possessiveness, insecurity, joy, curiosity, vulnerability, lack of responsibility, a need for love, intense dependence, innocence, and are symbols of the purest form of a human whose possibilities are endless. Also represents a new phase of life.
Many people from time to time will have babies or small children in their dreams. If the baby is a stranger to you, you can assume that it represents you. You are the baby and the dream is telling you something about your development in a particular area of your life. At times of great change and renewal, a baby may appear in a dream and represent your potential and a new beginning.

Ex - To dream about your ex-boyfriend/girlfriend or ex-husband/wife, suggests that something or someone in your current life is bringing out similar feelings you felt during the relationship with your ex, or that you are finding yourself in a similar situation that you do not want to be in. The dream may be a way of alerting you to the same or similar behavior in a current relationship. What you learn from that previous relationship may need to be applied to the present one, so that you do not repeat the same mistake. Past lovers may also highlight the positive experiences you had with that person.
Alternatively, to see your ex in your dream may also signify aspects of yourself, or feelings, that you have 'crossed out' or neglected.

Death - represents the end of something, with a new beginning ...IE:  leaving an old job for a new one...giving up of an old habit, or way of thinking. Death in a dream rarely means a real death.

4 - a positive symbol. The four represents immense inner strength, energy, vitality and a great love for and connection with nature. Four analyses and organizes, the four is where the change in the human personality takes place, representing accomplishment, completion, and wholeness(the completely integrated human psyche).
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Is there anything, or anyone, reminding you of your ex...dredging up old hurts and emotions?
Are you trying to put the past behind you...ready to start fresh?
Have you been offered a new job or opportunity of some sort, or started a new project, or relationship?
Are you feeling a bit vulnerable?

Hope this helps, good luck!